Allah states that Musa reminded his people about Allah's annals anddays and of Allah's favors and bounties that He bestowed on them,when He saved them from Fir` awn and his people and the tormentand disgrace they used to exert on them.

They used to slaughter whomever they could find among their sons and let their females live. Allah delivered them from all this torment, and this is a great bounty, indeed. This is why Allah described this affliction,

وَفِى ذَلِكُمْ بَلاَءٌ مِّن رَّبِّكُمْ عَظِيمٌ

The Outcome of Gratitude and Ingratitude

In the third verse (7), it was said: وَإِذْ تَأَذَّنَ رَ‌بُّكُمْ لَئِن شَكَرْ‌تُمْ لَأَزِيدَنَّكُمْ ۖ وَلَئِن كَفَرْ‌تُمْ إِنَّ عَذَابِي لَشَدِيدٌ (And when your Lord declared, "If you express gratitude, I shall certainly give you more, and if you are ungrateful, then My punishment is severe." ). The word: تَأَذَّنَ (ta'adhdhana) is used in the sense of making known or announcing. The sense of the verse is that Allah Ta’ ala has announced it for all to hear: 'If you are thankful for My blessings and do not waste them in acts of disobedience to Me and in deeds which have been prohibited, and try your best to mould your deeds to suit My pleasure, then, I shall increase these blessings for you.' This increase could be in the amount and volume of blessings, or it could be in their continuity and permanence as well. The Holy Prophet وَأَنذِرْ‌ عَشِيرَ‌تَكَ الْأَقْرَ‌بِينَ said: 'A person who is blessed with the Taufiq to be grateful shall never be deprived of barakah and increase in blessings.' (Reported by Ibn Marduwayh from Ibn ` Abbas ؓ - Mazhari)