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fa-lā wa-rabbika lā yuʾminūna ḥattā yuḥakkimūka fī-mā shajara baynahum thumma lā yajidū fī ʾanfusihim ḥarajan mimmā qaḍayta wa-yusallimū taslīman
But no, by your Lord! They will not believe until they make you a judge in their disputes, then do not find within their hearts any dissent to your verdict and submit in full submission.
— Ali Quli Qarai
Surah An-Nisa', Verse 65
65. "But no, by your Lord! They do not believe (in reality) until they make you the judge regarding the disagreement between them, then they find within themselves no dislike of which you decide and submit with full submission."
Occasion of Revelation
There was a dispute between Zubayr-ibn-'Awam (one of the Emigrants) and another Muslim from the Helpers upon the irrigation of a palm-plantation. Since the Upper part of the garden belonged to Zubayr, the Prophet (S) judged that he should irrigate it first. The other man, the Helper, became worried from the Prophet's judgement (S) and told him: "As Zubayr is your cousin, you judged in his benefit." As soon as he uttered that expression, the face of the Prophet (S) paled, and the above verse was revealed.
Surprising! They themselves elected the Prophet (S) as an arbitrator, but they refused his judgement. Imam -Sadiq (as) in a tradition said:
"If some people worship Allah by establishing prayer, performing Hajj pilgrimage, paying alms, and so on to adore Him, but they doubt about the deeds of the Messenger of Allah (S), they are not, indeed, believers."
Then he (as) recited this verse.
However, the signs of a true believer are three:
A) Instead of referring to the false deities, he takes the judgement to the Prophet (S).
B) He should not have any suspicion to the judgement of the Messenger of Allah (S).
C) He ought to accept the command of the Prophet (S) ardently and surrender to it.
By the way, judgement is from among the ranks of messenger ship and master ship. And, personal attitude against the sacred Qur'anic text is forbidden, because this manner is the sign of faithlessness, (regarding to the occasion of revelation).