Narrated Umm Salamah, wife of the Prophet ﷺ: The reading of the following verse by the Prophet ﷺ goes: "Nay, but there came to thee (ja'atki) my signs, and thou didst reject them (fakadhdhabti biha) ; thou wast haughty (wastakbarti) and became one of those who reject Faith (wa kunti). Abu Dawud said: This is a mursal tradition, ie the link of the Companion has been omitted, for the narrator al-Rabi' did not meet Umm Salamah.
The lesson for children is that they should always stay humble in their beliefs and actions, strive for faith in God, and never become arrogant or think too highly of themselves as it will lead them away from God's mercy. They should also remember to read the Quran regularly so they can learn more about their religion and gain knowledge about what is right or wrong according to Islam.