'Adi bin Hatim (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) said, "Guard yourselves against the Fire (of Hell) even if it be only with half a date-fruit (given in charity); and if you cannot afford even that, you should at least say a good word."[Al-Bukhari and Muslim].
App reference: Book 2, Hadith 13
Arabic/English book reference: Book 2, Hadith 693