Hadith 20:583
Ibn 'Abbas (May Allah be pleased with them) reported:
Messenger of Allah (ﷺ) passed by the graves at Al-Madinah. He turned his face towards them and said, "May you be granted safety, O inmates of the graves. May Allah forgive us and you. You have preceded us, and we are to follow." [At-Tirmidhi, who classified it as Hadith Hasan] .
وعن ابن عباس رضي الله عنهما، قال مر رسول الله صلى الله عليه وسلم بقبور بالمدينة فأقبل عليهم بوجهه فقال: “السلام عليكم يا أهل القبور، يغفر الله لنا ولكم أنتم سلفنا ونحن بالأثر” ((رواه الترمذي وقال: حديث حسن))