The Messenger of Allah ﷺ said, "Let my nation learn the rites of pilgrimage from me, and throw pebbles the size of small finger-flicked stones."
حدثنا وكيع حدثنا سفيان عن أبي الزبير
أن رسول الله ﷺ قال لتأخذ أمتي مناسكها وارموا بمثل حصى الخذف
Its chain of transmission is sahih. Its wording is found in Ibn Majah 3023, and the wording "Take from me your rites of pilgrimage" is found in the sahih collections.