Musnad Ahmad 1850

It was narrated that Ibn "Abbas said: The Messenger of Allah (ﷺ) said to me on the morning of Muzdalifah: "Pick up (pebbles) for me.” I picked up for him small pebbles (the size of broad beans). When I put them in his hand, he said: "Yes, like these. And beware of going to extremes in religious matters, for those who came before you were destroyed because of going to extremes in religious matters.”