Migration to Medina
Hazrat Ubaidah bin Harith migrated to Medina along with his two brothers, Hazrat Tufail bin Harith and Hazrat Hussain bin Harith. Hazrat Mistah bin Usasah was also with them. Prior to the journey, they had decided to meet in the valley of Najeh. However, Hazrat Mistah bin Usasah remained behind as he was bitten by a snake. The following day, when they were informed of him being bitten by a snake, they returned and travelled with him to Medina. They stayed with Hazrat Abdur Rahman bin Salamah in Medina.
(al-Tabaqaat-ul-Kubra, Vol. 3, p. 37, Ubaidah bin Harith, Dar-ul-Kutb al-Ilmiyyah, Beirut, 1990)