The Messenger of Allah ﷺ said, "No two Muslims meet and shake hands without being forgiven before they part."
حدثنا أبو بكر بن أبي شيبة حدثنا أبو خالد الأحمر وعبد الله بن نمير عن الأجلح عن أبي إسحق
قال رسول الله ﷺ ما من مسلمين يلتقيان فيتصافحان إلا غفر لهما قبل أن يتفرقا
Its chain is daif. Abu Dawud narrated it in the Book of Manners, Chapter on Handshaking, no. 5212, from Ibn Abu Shayba with this wording, and it is in Musannaf, 8/431. Abu Ishaq narrated with "an" (elliptical transmission), and Ajlah was mentioned previously, no. 2117. Tirmidhi graded it hasan, and the hadith has many corroborating witnesses.