Musnad Ahmad 788:270

Yazid narrated to us, he said: Hammad ibn Salamah informed us, from Thabit al-Bunani, he said: Someone who heard Hattan ibn Abdullah narrate to me, from Abu Musa al-Ash'ari, he said: I said to a man, "Come, let us make this day of ours for Allah, the Almighty and Majestic." By Allah, it was as if the Messenger of Allah (peace and blessings of Allah be upon him) witnessed this, so he gave a sermon and said: "And among them is he who says, 'Come, let us make this day of ours for Allah, the Almighty and Majestic.'" He kept repeating it until I wished that the earth had swallowed me up.