Surah Yusuf · سُوْرَةُ يُوسُفَ · Juz 13
Q 12:66
قَالَ لَنْ أُرْسِلَهُۥ مَعَكُمْ حَتَّىٰ تُؤْتُونِ مَوْثِقًا مِّنَ ٱللَّهِ لَتَأْتُنَّنِى بِهِۦٓ إِلَّآ أَن يُحَاطَ بِكُمْ ۖ فَلَمَّآ ءَاتَوْهُ مَوْثِقَهُمْ قَالَ ٱللَّهُ عَلَىٰ مَا نَقُولُ وَكِيلٌ
Translations
[Jacob] said, "Never will I send him with you until you give me a promise by Allah that you will bring him [back] to me, unless you should be surrounded by enemies." And when they had given their promise, he said, "Allah, over what we say, is Witness."- Il dit: «Jamais je ne l'enverrai avec vous, jusqu'à ce que vous m'apportiez l'engagement formel au nom d'Allah que vous me le ramènerez à moins que vous ne soyez cernés». Lorsqu'ils lui eurent apporté l'engagement, il dit: «Allah est garant de ce que nous disons».Tafsir
Their father told them he would not send their brother with them until they had sworn by Allah that they would bring him back, unless destruction overwhelmed them all and none of them remained, and they were unable to do anything about it or to return. When they had given their father a firm promise in Allah's name, he said that Allah was a witness over what they said, and His witnessing was sufficient for them.
Read Ibn Kathir (Ibn Kathir (abridged, English))
Arabic text: Tanzil (Uthmani). Translations: Sahih International (en), Muhammad Hamidullah (fr). tanzil.net