They did not count from the Prophet's ﷺ commissioning, nor from his death. They counted only from his arrival in Medina.
حدثنا عبد الله بن مسلمة حدثنا عبد العزيز عن أبيه
ما عدوا من مبعث النبي ﷺ ولا من وفاته ما عدوا إلا من مقدمه المدينة
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