Musnad Ahmad 33:645

Musa narrated to us, Ibn Lahi'ah informed us, from Abu al-Zubayr, who said: I asked Jabir about the eclipse of the sun and the moon. Jabir said: I heard the Prophet, peace and blessings of Allah be upon him, saying: "Indeed, the sun and the moon, when they are eclipsed, or one of them, then when you see that, pray until the eclipse of whichever of them was eclipsed clears."