Mukhtasar Bukhari (Abridged) 854 — Stoning the Jamarat is obligatory

A man asked `Sayyiduna Ibn Umar (may Allah be pleased with them both)` at what time should he throw the pebbles at the Jamarat. He replied: "At the time your Imam throws, you should also throw." The man asked him the same question again, so he replied: "We used to wait, and when the sun would decline (past midday), then we would throw the pebbles."