(Annoor) 24 : 51
إِنَّمَا كَانَ قَوْلَ الْمُؤْمِنِينَ إِذَا دُعُوا إِلَى اللَّهِ وَرَسُولِهِ لِيَحْكُمَ بَيْنَهُمْ أَنْ يَقُولُوا سَمِعْنَا وَأَطَعْنَا ۚ وَأُولَٰئِكَ هُمُ الْمُفْلِحُونَ
Indeed, the only statement of the believers when they are called to the Lord Allah and to His Messenger to judge between them will be: "We heard and we obeyed"; and they are prosperous.
Today since Adhikr is codified as the Splendid Book, the believer who testifies will follow a mode of prayer and lifestyle as explained in verses 7: 205-206. See explanation 2: 256, 285-286; 7: 157-158 and 23: 102-103.