وَظَلَّلْنَا عَلَيْكُمُ الْغَمَامَ وَأَنزَلْنَا عَلَيْكُمُ الْمَنَّ وَالسَّلْوَىٰ ۖ كُلُوا مِن طَيِّبَاتِ مَا رَزَقْنَاكُمْ ۖ وَمَا ظَلَمُونَا وَلَٰكِن كَانُوا أَنفُسَهُمْ يَظْلِمُونَ (57)
(2:57) (Remember that) We caused the cloud to overshadow you and provided you with *72 manna and salva *73 for your food, saying, "Eat of the clean and pure things We have bestowed upon you" (In spite of this, your forefathers violated Our commands:) however, they did not harm Us but harmed only themselves.
*72). That is, God provided them with shade from clouds in the Sinai peninsula where there was no shelter from the heat of the sun.
It should be remembered that the Israelites had left Egypt in their hundreds of thousands. In Sinai, there were not even any tents in which they could shelter, never mind proper houses. But for the fact that God by His grace kept the sky, overcast for a considerable period, these people would have been scorched to death by the heat of the sun.
*73). Manna and quails constituted the natural food that was continually made available to them throughout the forty years of their wandering in the Sinai desert. Manna was like coriander seed. When the dew fell in the night, manna fell with it from above. By God's grace the quails were made available so plentifully that the entire nation was able to live on them alone and so escaped starvation. (For details regarding manna and quails see Exodus 16; Numbers 11: 7-9 and 31-2; Joshua 5: 12)