"Ibn 'Abbas said: 'The Messenger of Allah ﷺ, Abu Bakr and 'Umar were among the Muhajirin (emigrants), because they forsook (hajaru) the idolators, and some of the Ansar were Muhajirun because Al-Madinah was a land of shirk, and they came to the Messenger of Allah ﷺ on the Night of Al-'Aqabah."'  

ابْنُ عَبَّاسٍ إِنَّ رَسُولَ اللَّهِ ﷺ وَأَبَا بَكْرٍ وَعُمَرَ كَانُوا مِنَ الْمُهَاجِرِينَ لأَنَّهُمْ هَجَرُوا الْمُشْرِكِينَ وَكَانَ مِنَ الأَنْصَارِ مُهَاجِرُونَ لأَنَّ الْمَدِينَةَ كَانَتْ دَارَ شِرْكٍ فَجَاءُوا إِلَى رَسُولِ اللَّهِ ﷺ لَيْلَةَ الْعَقَبَةِ