﴿ وَيَخِرُّونَ لِلْأَذْقَانِ يَبْكُونَ وَيَزِيدُهُمْ خُشُوعًۭا ۩ ﴾

“And so they fall down upon their faces, weeping, and [their consciousness of God's grace] increases their humility.”

And they fall down on their faces weeping yabkūna is a supplement to yakhirrūna ‘they fall down’ also containing an adjectival qualification of those falling down; and it the Qur’ān increases them in humility’ in humbleness before God.