Tomorrow] Why not presently? the plague being so grievous, he might thinke, either that by that time they might be withdrawn some other way, and so they should not need to be beholding to God or Moses for that favour: or he might thinke, that though the frogs might come on a sudden, it was not so easie a matter to remove them again, and that therefore Moses must have some time to mediate with God for that mercy, and to make it take a full effect.