Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
278. Chapter: On the prohibition against using a gift to cause a sense of indebtedness
Allah Almighty says, "You who believe! Do not nullify your sadaqa by demands for gratitude or insulting words," (W:263; H2:264)
and the Almighty says, "Those who spend their wealth in the Way of Allah, and then do not follow what they have spent by demands for gratitude or insulting words" (W2:261; H2:262)
1588. Abu Dharr reported that the Prophet, may Allah bless him and grant him peace, said, "There are three people that Allah will not speak to nor look at nor purify on the Day of Rising, and they will have a painful punishment." Abu Dharr said, "The Messenger of Allah, may Allah bless him and grant him peace, said it three times." Abu Dharr said, "They are ruined and have lost! Who are they, Messenger of Allah?" He said, "Someone who lets his garment hang down out of pride, someone who makes people indebted to him through doing them favours and someone who tries to sell his goods by making false oaths." [Muslim]
One of Muslim's variants has, "Lets his wrapper hang down."