The Messenger of Allah ﷺ said, "No two Muslims meet and shake hands without being forgiven before they part."
حدثنا ابن نمير حدثنا الأجلح عن أبي إسحاق
قال رسول الله ﷺ ما من مسلمين يلتقيان فيتصافحان إلا غفر لهما قبل أن يتفرقا
Its chain is hasan, because of Ajlah bin Abdullah. The hadith was reported by Abu Dawud 4/254, no. 5212, in the Book of Manners, in the section on handshaking, and Tirmidhi 5/74, no. 2727, in the Book of Seeking Permission, and Ibn Majah 2/1220, no. 3703.