After the night escape from Makkah and three days hidden in the cave of Thawr, the Prophet ﷺ and Abū Bakr travelled the coastal track north for some two weeks, guided by ʿAbdullāh ibn Urayqiṭ. On Monday 8 Rabīʿ al-Awwal they reached Qubāʾ, an oasis village on the southern approach to Yathrib, and lodged with Kulthūm ibn al-Hidm of the Banū ʿAmr ibn ʿAwf.
The arrival closed the emigration that would come, seventeen years later under ʿUmar, to mark year one of the Muslim calendar. The Prophet ﷺ stayed in Qubāʾ some days — long enough to lay out the mosque recorded in this month's companion entry — before entering Madinah itself on a Friday.
The day is transmitted with unusual consistency for the period, though as with all dates before the calendar's institution, the Julian pairing is a scholars' reconstruction.