Amatul Rahmân Omer:
And We made an appointment with Moses for thirty nights (and days to pray in solitude) which We supplemented with another ten (to rceive the Law) so that the period appointed by his Lord came to be full forty nights (and days). (When leaving) Moses said to his brother Aaron, `Act for me (taking my place) in my absence among my people and reform and manage (them) well and do not follow the way of those who create disorder.´
