Abbas - Tanwîr al-Miqbâs min Tafsîr Ibn ‘Abbâs
(And We verily gave the Scripture) i.e. the Torah (unto Moses after We had destroyed the generations of old) before Moses; (clear testimonies) a clarification (for mankind) for the Children of Israel, (and a guidance) from error (and a mercy) for those who believe in it, (that haply they might reflect) in order that they make take admonition and believe in it.
And verily We gave Moses the Scripture, the Torah, after We had destroyed the former generations, the people of Noah, ‘Ād, Thamūd and others, [containing] eye-openers for mankind (basā’ira, is a circumstantial qualifier referring to al-kitāb, ‘the Scripture’, the plural of basīra, which is the [perceptive] light of the heart), in other words, illumination for the hearts [of mankind], and as guidance, from error, for those who implement it, and mercy, for those who believe therein, that perhaps they might remember, [that] they might be admonished by the admonitions it [the Scripture] contains.
Allah tells us about the blessings which He gave His servant and Messenger Musa, the speaker, may the best of peace and blessings from his Lord be upon him, He revealed the Tawrah to him after He destroyed Fir`awn and his chiefs.
مِن بَعْدِ مَآ أَهْلَكْنَا الْقُرُونَ الاٍّولَى
(after We had destroyed the generations of old) After the revelation of the Tawrah, no nation would again be punished with an overwhelming calamity; instead the believers were now commanded to fight the enemies of Allah among the idolators, as Allah says: