We told Moses to stay with Us for thirty nights (in the mountains) but added ten nights more so his appointment with his Lord came to an end after forty nights. Moses had appointed his brother Aaron as his deputy among his people during his absence saying, "Try to reform them and do not follow the way of the evil-doers."
و با موسى سى شب وعده كرديم و آن را به ده شب ديگر كامل نموديم پس ميقات پروردگارش در چهل شب به سر آمد. و موسى به برادرش هارون گفت: ميان قوم من نايب من باش و به اصلاح [كارشان‌] پرداز و طريق مفسدان را پيروى مكن