6.
The Book of Charity (Zakat)
٦-
كِتَابُ الزَّكَاةِ

The chapter on the severity in returning from voluntary charity and likening it to a dog that vomits and then returns to its vomit.

بَابُ التَّغْلِيظِ فِي الرُّجُوعِ عَنْ صَدَقَةِ التَّطَوُّعِ وَتَمْثِيلِهِ بِالْكَلْبِ يَقِيءُ ثُمَّ يَعُودُ فِي قَيْئِهِ

Sahih Ibn Khuzaymah 2476

Reference    : Sahih Ibn Khuzaymah 2476