Musa reminded the Children of Israel of Allah's blessings, such as saving them from Fir`awn, his tyranny and the humiliation and disgrace they suffered. He reminded them of the glory and revenge against their enemy, when they watched them suffering in disgrace, destroyed by drowning and meeting utter demise. We mentioned this subject in the Tafsir of Surat Al-Baqarah.

﴿وَوَعَدْنَا مُوسَى ثَلَـثِينَ لَيْلَةً وَأَتْمَمْنَاهَا بِعَشْرٍ فَتَمَّ مِيقَـتُ رَبِّهِ أَرْبَعِينَ لَيْلَةً وَقَالَ مُوسَى لاًّخِيهِ هَـرُونَ اخْلُفْنِى فِى قَوْمِى وَأَصْلِحْ وَلاَ تَتَّبِعْ سَبِيلَ الْمُفْسِدِينَ ﴾

(142. And We appointed for Musa thirty nights and added ten, and he completed the term, appointed by his Lord, of forty nights. And Musa said to his brother Harun: "Replace me among my people, act in the right way and follow not the way of the mischief-makers.'')