Surah 37. As-Saffat, Ayah 2

The three acts in verses 1-3 are consecutive, as shown by the particle fa. I understand them to mean that angels and good men (1) are ever ready to range themselves in ranks in the service of Allah and work in perfect discipline and accord at all times; (2) that they check and frustrate evil wherever they find it and they are strengthened in doing so by their discipline and their ranging themselves in ranks; and (3) that this service furthers the Kingdom of Allah and proclaims His Message and His glory to all creation.