(Abraham: Original Messenger of Islam*)
You shall strive for the cause of God as you should strive for His cause. He has chosen you and has placed no hardship on you in practicing your religion – the religion of your father Abraham. He is the one who named you “Submitters” originally. Thus, the messenger shall serve as a witness among you, and you shall serve as witnesses among the people. Therefore, you shall observe the Contact Prayers (Salat) and give the obligatory charity (Zakat), and hold fast to God; He is your Lord, the best Lord and the best Supporter.
وَجٰهِدوا فِى اللَّهِ حَقَّ جِهادِهِ هُوَ اجتَبىٰكُم وَما جَعَلَ عَلَيكُم فِى الدّينِ مِن حَرَجٍ مِلَّةَ أَبيكُم إِبرٰهيمَ هُوَ سَمّىٰكُمُ المُسلِمينَ مِن قَبلُ وَفى هٰذا لِيَكونَ الرَّسولُ شَهيدًا عَلَيكُم وَتَكونوا شُهَداءَ عَلَى النّاسِ فَأَقيمُوا الصَّلوٰةَ وَءاتُوا الزَّكوٰةَ وَاعتَصِموا بِاللَّهِ هُوَ مَولىٰكُم فَنِعمَ المَولىٰ وَنِعمَ النَّصيرُ
wa jaahidoo fil laahi haqqa jihaadih; Huwaj tabaakum wa maa ja’ala ‘alaikum fid deeni min haraj; Millata abeekum Ibraaheem; Huwa sammaakumul muslimeena min qablu wa fee haaza li yakoonar Rasoolu shaheedan ‘alaikum wa takoonoo shuhadaaa’a ‘alan naas; fa aqeemus salaata wa aatuz zakaata wa’tasimoo billaahi Huwa mawlaakum fani’mal mawlaa wa ni’man naseer
*22:78 Although all messengers preached one and the same message, “Worship God alone,” Abraham was the first messenger to coin the terms “Submission” (Islam) and “Submitter” (Muslim) (2:128). What did Abraham contribute to Submission? We learn from 16:123 that all religious duties in Submission were revealed through Abraham (see Appendices 9 & 26).