until when he reached the rising of the sun the place where it rises he found it rising on a folk namely Negroes zanj for whom We had not provided against it that is against the sun any form of cover in the way of clothing or roofing as their land could not support any structures; they had underground tunnels into which they would disappear at the rising of the sun and out of which they would emerge when it was at its highest point in the sky.
