the Prophet said: "When the charity collector comes to you, then he should not depart from you except while pleased."
Jami` at-Tirmidhi Book 7, Hadith 31
← Previous Hadith the Messenger of Allah said: "The one who commits transgression with charity is like the one who does not pay it."

Jami` at-Tirmidhi Book 7, Hadith 30 Next Hadith → similar (narration to no. 647 with a different chain) from the Prophet.

Jami` at-Tirmidhi Book 7, Hadith 32