It is narrated from Khalid bin Abi Jabal al-Adwani (may Allah be pleased with him) that he saw the Messenger of Allah (peace and blessings be upon him) in the eastern part (the market) of Thaqif, standing leaning on a bow or a staff and reciting the surah 'Wa al-sama'i wa al-tariq' (By the sky and the night-comer) until he completed it. I memorised it in the time of Ignorance (Jahiliyyah) while I was a polytheist, then I recited it (again) in Islam.
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4111