(Yoosuf) 12 : 66
قَالَ لَنْ أُرْسِلَهُ مَعَكُمْ حَتَّىٰ تُؤْتُونِ مَوْثِقًا مِنَ اللَّهِ لَتَأْتُنَّنِي بِهِ إِلَّا أَنْ يُحَاطَ بِكُمْ ۖ فَلَمَّا آتَوْهُ مَوْثِقَهُمْ قَالَ اللَّهُ عَلَىٰ مَا نَقُولُ وَكِيلٌ
He said: "Never will I send him with you until you solemn pledge with Allah that you will bring him back to me except you are surrounded with any crisis"; and when they gave their promise, he said: "Lord Allah is a Custodian over whatever we are saying".