His saying: "Rivalry in worldly increase diverts you," meaning: in the worldly life, away from the Hereafter. It refers to rivalry in wealth and children.
قَوْله: ﴿أَلْهَاكُم التكاثر﴾ أَي فِي: الدُّنْيَا عَنِ الْآخِرَةِ، وَهُوَ التَّكَاثُرُ فِي الْمَالِ وَالْولد
