Sahih al-Bukhari, Volume 8, Book 74, Hadith 279 (USC-MSA) ⓘ
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: Book 79, Hadith 37 (In-Book) & Hadith 6263 (DarusSalam)