Do we have to obey the Messenger?
Yes, in Sourat Al Nesaa 59, Allah Said:
يَا أَيُّهَا الَّذِينَ آمَنُوا أَطِيعُوا اللَّهَ وَأَطِيعُوا “الرَّسُولَ وَأُولِي الْأَمْرِ مِنْكُمْ فَإِنْ تَنَازَعْتُمْ فِي شَيْءٍ فَرُدُّوهُ إِلَى اللَّهِ وَالرَّسُولِ إِنْ كُنْتُمْ تُؤْمِنُونَ بِاللَّهِ وَالْيَوْمِ الْآخِرِ ذَلِكَ خَيْرٌ وَأَحْسَنُ تَأْوِيلًا”
O you who believe! Obey Allâh and obey the Messenger (Muhammad SAW), and those of you (Muslims) who are in authority. (And) if you differ in anything amongst yourselves, refer it to Allâh and His Messenger (SAW), if you believe in Allâh and in the Last Day. That is better and more suitable for final determination.
وَمَنْ يُطِعِ اللَّهَ وَالرَّسُولَ فَأُولَئِكَ مَعَ الَّذِينَ أَنْعَمَ اللَّهُ عَلَيْهِمْ مِنَ النَّبِيِّينَ وَالصِّدِّيقِينَ وَالشُّهَدَاءِ وَالصَّالِحِينَ وَحَسُنَ أُولَئِكَ رَفِيقًا
(69)And whoso obeys Allâh and the Messenger (Muhammad SAW), then they will be in the company of those on whom Allâh has bestowed His Grace, of the Prophets, the Siddiqûn >), the martyrs, and the righteous. And how excellent these companions are!
ذَلِكَ الْفَضْلُ مِنَ اللَّهِ وَكَفَى بِاللَّهِ عَلِيمًا
(70)
Such is the bounty from Allah: And sufficient is it that Allah knoweth all.