Al-Kāfi - Volume 7 > The Matters Permissible in Endowment, Charity, Gift, Present, Providing Conditional Housing and Matters Permissible or otherwise for a Child and others
Hadith #41

41- أَبَانٌ عَنْ أَبِي الْجَارُودِ قَالَ قَالَ أَبُو جَعْفَرٍ (عَلَيْهِ السَّلام) لا يَشْتَرِي الرَّجُلُ مَا تَصَدَّقَ بِهِ وَإِنْ تَصَدَّقَ بِمَسْكَنٍ عَلَى ذِي قَرَابَتِهِ فَإِنْ شَاءَ سَكَنَ مَعَهُمْ وَإِنْ تَصَدَّقَ بِخَادِمٍ عَلَى ذِي قَرَابَتِهِ خَدَمَتْهُ إِنْ شَاءَ اللهُ.

41. Aban has narrated from abu al-Jarud who has narrated the following: “Abu Ja‘far, ‘Alayhi al-Salam, has said, ‘A man cannot buy what he has given as charity. If he gives as charity a house to a relative then if he likes he can live with them. If he gives in charity a servant to a relative he can serve him by the will of Allah.’”