Sunan an-Nasa'i 2953
سنن النسائي#2953SahihIt was narrated that Ibn Umar said:"Since I saw the Messenger of Allah touch it, I did not fail to touching the Stone whether it was easy or difficult
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 24:336