The Prophet (ﷺ) said: If two Muslims meet, shake hands, praise Allah, and ask Him for forgiveness, they will be forgiven.
Sunan Abi Dawud Book 43, Hadith 439
← Previous Hadith AbuDawud said: Al-Hasan ibn Ali traced this tradition back to the Prophet (ﷺ): When people are passing by, it is enough if one of them gives a salutation on their behalf, and that it is enough for those who are sitting if one of them replies.

Sunan Abi Dawud Book 43, Hadith 438 Next Hadith → The Prophet (ﷺ) said: Two Muslims will not meet and shake hands having their sins forgiven them before they separate.

Sunan Abi Dawud Book 43, Hadith 440