Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him), in what he put forward as proof to the Ansar on the day of Saqifah, said: Allah Almighty sent Muhammad (peace and blessings be upon him) "with guidance and the religion of truth" [Surah al-Tawbah: 33]. The Messenger of Allah (peace and blessings be upon him) called to Islam, and Allah Almighty turned our hearts and our forelocks towards that to which we were called. We, the group of the Muhajirun, were the first to accept Islam, and we are his (peace and blessings be upon him) relatives.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوقف / 11923