[Machine] There is no marriage without a guardian and two just witnesses. This is a valid chain of narration and Ibn Musayyib was called the narrator of Umar. Ibn Umar used to send for him to ask him about some matters related to Umar and his affairs.
لَا نِكَاحَ إِلَّا بِوَلِيٍّ وَشَاهِدَيْ عَدْلٍ هَذَا إِسْنَادٌ صَحِيحٌ وَابْنُ الْمُسَيِّبِ كَانَ يُقَالُ لَهُ رَاوِيَةُ عُمَرَ وَكَانَ ابْنُ عُمَرَ يُرْسِلُ إِلَيْهِ يَسْأَلُهُ عَنْ بَعْضِ شَأْنِ عُمَرَ وَأَمْرِهِ