Sunan At-Tirmidhi

Narrated Abu Hurairah: That the Messenger of Allah (ﷺ) said: ""Three will not be spoken to by Allah on the Day of Judgement, nor will they be purified, and for them is a painful torment: A man that gave a pledge to an Imam, and if he gives to him he fulfills it, and if he does not give to him he does not fulfill not fulfill it."" [Abu 'Eisa said:] This Hadith is Hasan Sahih