Translation:

65. But no by thy Lord they can have no (real) Faith until they make thee judge in all disputes between them and find in their souls no resistance against thy decisions but accept them with the fullest conviction.

Notes (Tafseer)

583. The test of true Faith is not mere lip profession, but bringing all our doubts and disputes to the one in whom we profess faith. Further, when a decision is given we are not only to accept it, but find in our inmost souls no difficulty and no resistance, but on the contrary a joyful acceptance springing from the conviction of our own faith.