Sahih al-Bukhari, Book 79, Hadith 37 (In-Book) ⓘ
Narrated Qatada: I asked Anas, "Was it a custom of the companions of the Prophet to shake hands with one another?" He said, "Yes."
حَدَّثَنَا عَمْرُو بْنُ عَاصِمٍ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، قَالَ قُلْتُ لأَنَسٍ أَكَانَتِ الْمُصَافَحَةُ فِي أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم قَالَ نَعَمْ.
also referenced under: Hadith 6263 (DarusSalam) & Volume 8, Book 74, Hadith 279 (USC-MSA)