"I heard Abu Mijlaz say: 'I asked Ibn 'Abbas something about the Jimar, and he said: I do not know, the Messenger of Allah stoned it with six or seven.
Sunan an-Nasa'i Book 24, Hadith 461
← Previous Hadith "We returned during the Hajj with the Prophet and some of us said that they had stoned (the Jamarat) with seven stones, and other said that they had done so with six, and no one denounced anyone else."

Sunan an-Nasa'i Book 24, Hadith 460 Next Hadith → "I was riding behind the Prophet and he continued to recite the Talbiyah until he stoned Jamratul'Aqabah. He stoned it with seven pebbles, saying the Takbir with each throw."

Sunan an-Nasa'i Book 24, Hadith 462