﴿ قَالَ هَٰذَا فِرَاقُ بَيْنِى وَبَيْنِكَ ۚ سَأُنَبِّئُكَ بِتَأْوِيلِ مَا لَمْ تَسْتَطِع عَّلَيْهِ صَبْرًا ﴾

“[The sage] replied: "This is the parting of ways between me and thee. [And now] I shall let thee know the real meaning of all [those events] that thou wert unable to bear with patience:,”

Said he al-Khidr to him ‘This is the parting that is the moment for parting between me and you baynī wa-baynika here the preposition bayna has been annexed to a non-multiple noun but this is allowed grammatically because it is then repeated with its other noun together with the coordinating wāw. I will inform you before I part company with you the interpretation of that over which you were not able to maintain patience.