Imam Bukhari narrates: Ishaq narrated to us, he said: Ja'far bin Aun informed us, he said: Abu al-'Umais narrated to us from Aun bin Abi Juhaifah from his own father, he said that

I saw the Messenger of Allāh ﷺ outside Makkah in the valley of Abtah. Bilal, may Allāh be pleased with him, came to him and informed him of the prayer. Then Bilal came out with a spear, until he planted it in front of the Messenger of Allāh ﷺ in that valley, and said the Iqamah for prayer.