I want to know why did the Prophet Muhammad [SAW] kiss Hajar-e-Aswad (black stone)? I am aware that it is Sunnah to kiss Hajar-e-Aswad for people performing Hajj and Umrah during tawaf, but is there any explanation in any Sahih Hadith elaborating why Prophet Muhammad [SAW] kissed it at all? Did he receive any wahi regarding it. Please explain.

Answered according to Hanafi Fiqh by Darulifta-Deoband.org

بسم الله الرحمن الرحيم

(Fatwa: 673/527/H=1434)

Each and every practice of the holy Prophet Muhammad (صلى الله عليه وسلم) was in accordance with wahi. Almighty Allah says in the holy Quran:
وَمَا يَنطِقُ عَنِ الْهَوَى [النجم : 3]
Thus the kissing of Hajr-e-Aswad at the time of tawaf shall be according to wahi.

Allah knows Best!

Darul Ifta,
Darul Uloom Deoband