Stay focused during prayer and don't get distracted by worldly matters.

This hadith is about the Prophet Muhammad's practice of pointing with his finger during prayer. It is narrated by 'Amr bin 'Abdullah bin Az-Zubair, who said that his father told him that when the Prophet sat in either the second or fourth rak'ah of prayer, he would place his hands on his knees and point with one finger. This action was done as a sign of humility and submission to Allah, as well as a reminder to focus on one's prayers and not be distracted by worldly matters. The lesson here for children is that they should always remember to stay focused on their prayers and not be distracted by anything else while praying.