فَلَمَّا رَجَعُوٓا۟ إِلَىٰٓ أَبِيهِمْ قَالُوا۟ يَٰٓأَبَانَا مُنِعَ مِنَّا ٱلْكَيْلُ فَأَرْسِلْ مَعَنَآ أَخَانَا نَكْتَلْ وَإِنَّا لَهُۥ لَحَٰفِظُونَ

So when they returned to their father, they said: O our father, the measure is withheld from us, therefore send with us our brother, (so that) we may get the measure, and we will most surely guard him.