It was narrated that Anas said:"When this Verse was revealed -'By no means shall you attain Al Birr (piety, righteousness--here it means Allah's reward, i.e. Paradise), unless you spend (in Allah's cause) of that which you love'- Abu Talha said: 'Our Lord will ask us about our wealth. I adjure you, O Messenger of Allah! I am giving my land to Allah.' The Messenger of Allah said: 'Make it for your relatives, Hassan bin Thabit and Ubayy bin Ka'b.'"
أَخْبَرَنَا أَبُو بَكْرِ بْنُ نَافِعٍ، قَالَ حَدَّثَنَا بَهْزٌ، قَالَ حَدَّثَنَا حَمَّادٌ، قَالَ حَدَّثَنَا ثَابِتٌ، عَنْ أَنَسٍ، قَالَ لَمَّا نَزَلَتْ هَذِهِ الآيَةُ { لَنْ تَنَالُوا الْبِرَّ حَتَّى تُنْفِقُوا مِمَّا تُحِبُّونَ } قَالَ أَبُو طَلْحَةَ إِنَّ رَبَّنَا لَيَسْأَلُنَا عَنْ أَمْوَالِنَا فَأُشْهِدُكَ يَا رَسُولَ اللَّهِ أَنِّي قَدْ جَعَلْتُ أَرْضِي لِلَّهِ . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " اجْعَلْهَا فِي قَرَابَتِكَ فِي حَسَّانَ بْنِ ثَابِتٍ وَأُبَىِّ بْنِ كَعْبٍ " .
Nesai
The Book of Endowments • Hadith 3602