Explanation of a person's happiness and misery

It is narrated from Sayyiduna Sa'd bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Three things belong to the happiness of the son of Adam, and three things belong to the misery of the son of Adam. Of the happiness of the son of Adam are: a righteous wife, a good house and a good mount. And of the misery of the son of Adam are: a cramped house, a bad wife and a bad mount."
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 Abu al-Darda (may Allah be pleased with him); he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Seek out your weak ones for me (that is, take care of them), for you are only given provision and helped because of your weak ones."
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 Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) set out on the day of Badr with three hundred and fifteen fighters, just as (Sayyiduna) Talut had set out. When the Messenger of Allah (peace and blessings be upon him) departed, he supplicated for them, saying: 'Allahumma innahum hufatun fa-hmilhum, Allahumma innahum 'uratun fa-ksuhum, Allahumma innahum jiya'un fa-ashbi'hum' (O Allah, they are barefoot, so give them mounts; O Allah, they are unclothed, so clothe them; O Allah, they are hungry, so fill them). So Allah granted them victory on the day of Badr, and they returned in such a state that every one of them came back with one or two camels; they also obtained clothing and ate their fill.
This hadith is sahih (authentic) on the condition of Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.