Musannaf Ibn Abi Shaybah 27542 — The rider greeting the one walking

Husayn said: Al-Sha'bi and I met a man who was riding, and al-Sha'bi was the first to greet him. I said, "You are the first to greet him, although we are both on foot and he is riding?" He said, "I saw Shurayh greeting a rider."