When Allah took away the soul of His Prophet at his death, the Ansar assembled In the shed of Bani Saʿida. I said to Abu Bakr, "Let us go." So, we come to them (i.e. to Ansar) at the shed of Bani Saʿida. (See Hadith No. 19, Vol. 5 for details)  

حِينَ تَوَفَّى اللَّهُ نَبِيَّهُ ﷺ إِنَّ الأَنْصَارَ اجْتَمَعُوا فِي سَقِيفَةِ بَنِي سَاعِدَةَ فَقُلْتُ لأَبِي بَكْرٍ انْطَلِقْ بِنَا فَجِئْنَاهُمْ فِي سَقِيفَةِ بَنِي سَاعِدَةَ