שמואל ב יז:יב פירוש: רש״י

And we will encamp upon him. We will encamp upon him language [denoting] camping as [we find], "It camped within the entire boorder of Mitzraim"²Shemos 10:14. [and] "Arom has camped opposite Ephraim."³Yeshayohu 7:2.