Translation of the verse 66 from Surah Al-Ma’idah : Number of verses 120 - - page 119 - Part 6.
And if only they had acted according to the Taurat (Torah), the Injeel (Gospel), and what has (now) been sent down to them from their Lord (the Quran), they would surely have gotten provision from above them and from underneath their feet. There are from among them people who are on the right course (i.e. they act on the revelation and believe in Prophet Muhammad SAW like 'Abdullah bin Salam), but many of them do evil deeds.
And if only they upheld [the law of] the Torah, the Gospel, and what has been revealed to them from their Lord, they would have consumed [provision] from above them and from beneath their feet. Among them are a moderate community, but many of them - evil is that which they do.
(5:66) Had the People of the Book observed the Torah and the Gospel, and all that had been revealed to them from their Lord, sustenance would have been showered over them from above and risen from beneath their feet. *96 Some among them certainly keep to the right path; but many of them do things which are evil.
*96) In the Old Testament, Leviticus (chapter 26) and Deuteronomy (chapter 28) record a sermon of Moses in which he impresses upon Israel, in great detail, the bounties and blessings of God with which they would be endowed if they obeyed His commandments, and the afflictions, scourges and devastations that would descend upon them if they disobeyed Him and rejected the Book of God. That sermon of Moses is the best explanation of this verse of the Qur'an.