Sunan Ibn Majah Book 25, Hadith 148
“On the morning of ‘Aqabah,
when
he was atop his she-camel, the Messenger of Allah (ﷺ) said:
‘Pick
up some pebbles for me.’ So I picked up seven pebbles for him,
suitable for Khadhf.* He began to toss them in his hand, saying:
‘Throw something like these.’ Then he said: ‘O people, beware
of
exaggeration in religious matters for those who came before you
were
doomed because of exaggeration in religious matters.’”
“I saw the Prophet (saw0 on the Day of Sacrifice, at ‘Aqabah Pillar, riding a mule. He said: ‘O people! When you stone the Pillar, throw small pebbles.’”
“When ‘Abdullah bin Mas’ud stoned ‘Aqabah Pillar, he went to the bottom of the valley and turned to face the Ka’bah, with the Pillar on his right hand side. Then he threw seven pebbles, saying the Takbir with each one. Then he said: ‘From here, by the One besides Whom there is none worthy of worship, did the one throw, to whom Surat Al-Baqarah was revealed.’”