An-Nur - 24:51

إِنَّمَا كَانَ قَوْلَ الْمُؤْمِنِينَ إِذَا دُعُوا إِلَى اللَّهِ وَرَسُولِهِ لِيَحْكُمَ بَيْنَهُمْ أَن يَقُولُوا سَمِعْنَا وَأَطَعْنَا وَأُوْلَئِكَ هُمُ الْمُفْلِحُونَ
[24:51]
The response of the believers, when they are invited to Allah and His Messenger that he may judge between them, is only to say: We hear and we obey; and these it is that are the successful.
The answer of the Believers, when summoned to Allah and His Messenger, in order that He may judge between them, is no other than this: they say, "We hear and we obey": it is such as these that will attain felicity.
The saying of (all true) believers when they appeal unto Allah and His messenger to judge between them is only that they say: We hear and we obey. And such are the successful.