(So let the Children of Israel go with us, and torment them not; indeed, we have come with a sign from your Lord! And peace will be upon him who follows the guidance!") (20:47)
وَآتَيْنَاهُم مِّنَ الْآيَاتِ مَا فِيهِ بَلَاءٌ مُّبِينٌ And We gave them the clear signs in which there was a manifest blessing. (44:33) " The word 'signs' refers to the miracles of the staff, the shining hand and others. The word 1 bala' has two senses: (1) blessing; and (2) trial. Here both senses are possible. (Qurtubi).
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 33–36
In this world, the downfall of one nation and the rise of another do not happen accidentally. Neither does it mean that a cruel nation has, on account of its oppressive methods, subjugated another. All such events take place in accordance with God’s decision, for the trial of man. It is God who, at His discretion, decides upon domination for one and subjection for another. Whatever He decides, it is based on His knowledge and is not arbitrary. God makes His decisions in accordance with His knowledge, in other words, whatever happens is on the basis of what one deserves. In the light of His total knowledge, God looks at the various peoples and then decides to give dominance to those nations whom He finds deserving: those whom He finds undeserving, He dethrones and commits to subjection. In the lives of nations, there appear signs to show that whatever fate befell them was by the decision of God. If a man’s insight is keen, he will be able to catch a glimpse of the causes leading to the decisions taken by God in respect of the various nations.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.