Riyad as-Salihin, Book 1, Hadith 546 (In-Book)

'Adi bin Hatim (May Allah be pleased with him) reported: Messenger of Allah said, "Protect yourself from Hell-fire even by giving a piece of date as charity."[Al-Bukhari and Muslim].

وعن عدى بن حاتم رضي الله عنه أن رسول الله صلى الله عليه وسلم قال‏:‏ ‏ "‏اتقوا النار ولو بشق تمرة‏" ‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏

sunnah.com