Surah 20. Ta-Ha, Ayah 64

Lit., "in one [single] line", i.e., in unison.

Cf. {7: 113-114}.

Presumably Pharaoh was in this secret conference, and he promises the most lavish rewards to the magicians if they overcome Moses. See vii. 114. That-but I think more than that-is implied. That day was to be the crisis: if they won then, they would win all along, and Moses and his people would be crushed.