Should I not tell you of the best witnesses? He is the one who produces his evidence before he is asked for it.  

أَنَّ النَّبِيَّ ﷺ قَالَ أَلاَ أُخْبِرُكُمْ بِخَيْرِ الشُّهَدَاءِ الَّذِي يَأْتِي بِشَهَادَتِهِ قَبْلَ أَنْ يُسْأَلَهَا