The Fire is forbidden to an eye that wept out of fear of Allah, and to an eye that stayed awake in the path of Allah

It is narrated from Sayyiduna Abu Rayhanah (may Allah be pleased with him); he said: We went out with the Messenger of Allah (peace and blessings be upon him) on a military expedition and reached a high place. There we were struck by such severe cold that one of us would dig a pit, enter it and cover himself with his shield. When the Messenger of Allah (peace and blessings be upon him) saw this distressing state of the people, he said: "Is there a man who will guard us tonight? I will make a supplication to Allah for him through which he will attain virtue." Then a man from the Ansar stood up and said: O Messenger of Allah, I (am ready). So he (peace and blessings be upon him) supplicated for him. Abu Rayhanah said: Then I said: I (am ready) too. So he (peace and blessings be upon him) supplicated for me as well, with a supplication somewhat lesser (in rank) than the one he made for the Ansari. Then the Messenger of Allah (peace and blessings be upon him) said: "The Fire has been made forbidden for an eye that shed tears out of fear of Allah; the Fire has been made forbidden for an eye that stayed awake in the way of Allah." The narrator said: I forgot the third thing. Abd al-Rahman bin Shurayh said: I heard afterwards that he (peace and blessings be upon him) had said: "The Fire has been made forbidden for an eye that lowered its gaze from what Allah has made unlawful," or he said: "an eye that was put out in the way of Allah."
This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Sahl Ibn al-Hanzaliyyah (may Allah be pleased with him) that the Companions set out with the Messenger of Allah (peace and blessings be upon him) on the day of Hunayn. They kept travelling without a break until evening came. I was present with the Messenger of Allah (peace and blessings be upon him) at the time of prayer when a horseman came and said: O Messenger of Allah, I went ahead of you (as a scout) until I climbed such-and-such a mountain, and there I saw that the tribe of Hawazin, all of them, with their women, their camels and their sheep and goats, had gathered at Hunayn. Hearing this, the Messenger of Allah (peace and blessings be upon him) smiled and said: "If Allah wills, tomorrow all of this will be spoils for the Muslims." Then he (peace and blessings be upon him) asked: "Who will guard us tonight?" Sayyiduna Anas bin Abi Marthad al-Ghanawi (may Allah be pleased with him) said: O Messenger of Allah, I am here. He (peace and blessings be upon him) said: "Mount." He mounted his horse and came to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said to him: "Go towards this mountain pass until you reach its top, and let us not be taken by surprise from your side tonight (through negligence)." When morning came, the Messenger of Allah (peace and blessings be upon him) came out to his place of prayer and offered two rak'ahs, then asked: "Have you sensed your horseman (that is, has he been seen)?" A man said: We have not seen him. Then the iqamah for the prayer was called, and the Messenger of Allah (peace and blessings be upon him) kept turning towards that pass even during the prayer until he (peace and blessings be upon him) completed his prayer. Then he said: "Rejoice, for your horseman has come." The narrator said: We began looking towards the shade of the trees in the pass, and suddenly he appeared, came up to the Messenger of Allah (peace and blessings be upon him), stopped, and greeted him with salam. Then he said: I set off until I reached the top of this pass where the Messenger of Allah (peace and blessings be upon him) had ordered me to go. When morning came, I looked over both passes but saw no one. The Messenger of Allah (peace and blessings be upon him) asked him: "Did you dismount (from your horse) tonight?" He said: No, except to pray or to relieve myself. The Messenger of Allah (peace and blessings be upon him) said to him: "You have made (Paradise) obligatory (for yourself); there is no harm for you now if you do no (further voluntary) deeds after this."
The chain of this hadith, from its beginning to its end, is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record the musnad reports of Sayyiduna Sahl Ibn al-Hanzaliyyah because few of the Tabi'in narrated from him, even though he is among the senior Companions.

It is narrated from Aslam Abu Imran that we set out from Madinah on a military expedition towards Constantinople. The commander of the army was Sayyiduna Abd al-Rahman bin Khalid bin al-Walid (may Allah be pleased with him), and the Romans had their backs against the wall of the city. Suddenly a man, all alone, charged at the enemy army, and the people cried out: Stop, stop! La ilaha illallah (there is no god but Allah)! This man is throwing himself into destruction with his own hands. Then Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) said: O people, this verse was revealed about us, the Ansar. When Allah helped His Prophet and made Islam prevail, we said (among ourselves): Come, let us now stay with our property and tend to it. Then Allah, the Mighty and Majestic, revealed this verse: "And spend in the way of Allah and do not throw yourselves into destruction with your own hands" [Surah al-Baqarah: 195]. So throwing oneself into destruction with one's own hands is in fact that we become absorbed in tending our property, sit back, and abandon jihad. Abu Imran said: Sayyiduna Abu Ayyub (may Allah be pleased with him) continued to wage jihad in the way of Allah until he was buried in Constantinople itself.
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.