I asked Ibn 'Umar: When should I throw pebbles at the jamrah? He replied: When your imam (leader at Hajj) throws pebbles, at that time you should throw them. I repeated the question to him. Thereupon he said: We used to wait for the time when the sun passes the meridian. When the sun declined, we threw the pebbles.
Reference: Sunan Abi Dawud 1972 In-book : Book 11, Hadith 252 English translation : Book 10, Hadith 1967
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