The best treasure a man can store is a righteous wife

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that when this verse was revealed: "And those who hoard gold and silver and do not spend it in the way of Allah" [Surah al-Tawbah: 34], it weighed very heavily upon the Muslims and they said: "None of us is able to leave wealth for his children that would remain after him (that is, they were distressed by the warning of punishment for hoarded wealth)." Sayyiduna Umar (may Allah be pleased with him) said: "I will relieve you of this worry." The narrator said: They all set off, and Sayyiduna Thawban (may Allah be pleased with him) followed behind Sayyiduna Umar (may Allah be pleased with him). They came to the Messenger of Allah (peace and blessings be upon him), and Sayyiduna Umar (may Allah be pleased with him) said: "O Prophet of Allah, this verse has weighed heavily upon your Companions." The Prophet of Allah (peace and blessings be upon him) said: "Indeed, Allah made zakah obligatory only to purify with it the rest of your wealth, and He made the laws of inheritance obligatory only for wealth that remains after you." The narrator said: At this Sayyiduna Umar (may Allah be pleased with him) said "Allahu Akbar" (with joy). Then the Prophet (peace and blessings be upon him) said to him: "Shall I not tell you of the best thing a person can store up as treasure? It is a righteous wife: when (her husband) looks at her she pleases him, when he gives her an instruction she obeys him, and when he is absent from her she guards him (his honour and property)."
This hadith is sahih in its chain, and the two Shaykhs did not record it.

It is narrated from Sayyiduna al-Miqdad bin al-Aswad (may Allah be pleased with him) that he was sitting on a small chest in Damascus. A man said to him: "If only you would stay back from the military expedition this year." He said: "'Al-Buhuth', that is, Surah al-Tawbah, has prevented us (from staying at home). Allah, the Mighty and Majestic, has said: 'Go forth, whether light or heavy' [Surah al-Tawbah: 41], and I find myself only light (ready and fit)."
This hadith is sahih in its chain, and the two Shaykhs did not record it.

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) concerning the saying of Allah, the Mighty and Majestic: "Do they not know that it is Allah who accepts repentance from His servants and receives charities?" [Surah al-Tawbah: 104], that he said: "Indeed, Allah accepts charity provided it is from pure (lawful) earnings, and He takes it in His right hand. And indeed, if a man gives in charity even the like of a morsel, Allah nurtures it for him just as one of you nurtures his young camel or his foal, until it grows in the palm of Allah, or he said: in the hand of Allah, until it becomes like (Mount) Uhud."
The two Shaykhs agreed on recording the hadith of Abu al-Hubab Sa'id bin Yasar from Abu Hurayrah with wording other than this. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), and they did not record it.