﴿ لَا يَسْبِقُونَهُۥ بِٱلْقَوْلِ وَهُم بِأَمْرِهِۦ يَعْمَلُونَ ﴾

“they speak not until He has spoken unto them, and [whenever they act,] they act at His behest.”

(They speak not until He hath spoken) Gabriel does not go ahead of Michael, whether by words or acts, until He commands him, (and they act by His command) and they, i.e. the angels, say and do in accordance with Allah's command.