Ash-Shu'araa • EN-AL-JALALAYN
﴿ وَتَقَلُّبَكَ فِى ٱلسَّٰجِدِينَ ﴾
“and [sees] thy behaviour among those who prostrate themselves [before Him]:”
and your movements — in performing the various parts of prayer standing sitting bowing and prostrating — among those who prostrate those who perform the prayers.