I saw the Messenger of Allah ﷺ perform ramal from the Black Stone until he returned to it, doing so for three circuits.
حدثنا إسحاق أخبرني مالك عن جعفر عن أبيه
رأيت رسول الله ﷺ رمل من الحجر الأسود حتى انتهى إليه ثلاثة أطواف
Its isnad is sahih. It has previously appeared many times in the account of the Prophet's ﷺ Hajj. See Sunan Abu Dawud 2/448, no. 1891, Tirmidhi 3/211, no. 856, and Ibn Majah 2/983, no. 2950.