49وَإِذْ نَجَّيْنَـٰكُم مِّنْ ءَالِ فِرْعَوْنَ يَسُومُونَكُمْ سُوٓءَ ٱلْعَذَابِ يُذَبِّحُونَ أَبْنَآءَكُمْ وَيَسْتَحْيُونَ نِسَآءَكُمْ ۚ وَفِى ذَٰلِكُم بَلَآءٌ مِّن رَّبِّكُمْ عَظِيمٌ
[49] Recall64 the time when We delivered you from the slavery of Pharaoh's people.65 They had inflicted a dreadful torment on you: they killed your sons and let your daughters live. And in this there was a hard trial for you from your your Lord.66
64The events recalled here were well known to all and sundry among the Jews. Therefore, only brief references have been made to these historical events to show that they had remained ungrateful and had persisted in evil deeds in spite of the continuous favours showered upon them by Allah.
65"AI-i-Fir' aunö includes both the people of Pharaoh's own family and the people belonging to the ruling class of Egypt.
66It was a trial of their character. They were made to pass through the fire of the test to see whether they were pure gold or a base metal. Moreover, they were put to the test to see whether they would be grateful to Allah after their miraculous escape.