The only statement of the [true] believers when they are called to Allah and His Messenger to judge between them is that they say, "We hear and we obey." And those are the successful.
English Transliteration
Innama kana qawla almumineena itha duAAoo ila Allahi warasoolihi liyahkuma baynahum an yaqooloo samiAAna waataAAna waolaika humu almuflihoona
Tafsir of Verse 51
All that the believers say, when they are called to God and His Messenger, that he may judge between them, is that they say, 'We hear, and we obey'; those -- they are the prosperers.
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.