Rashi, on Isa 13:2

“Upon the dark mountain lift ye up a banner, exalt the voice, lift up the hand, and let the rulers go into the gates.”

“On a tranquil mountain raise a banner to gather. On a tranquil, trusting, undisturbed mountain, raise a banner to the nations and raise your voice to those gathering, that they come upon it. wave your hand Wave your hand to the distant ones who cannot hear, and let them see the waving of the hand and enter the gates of the nobles, of the princes of Babylon. the gates Heb. פִּתְחֵי. As though it would say, בְּפִתְחֵי, into the gates. Comp. (Gen. 38:11) “Stay as a widow in your father’s house (בֵּית אָבִיךְ),” interpreted as בְּבֵית אָבִיךְ. Menachem ben Seruk (Machbereth Menachem p. 147) interpreted it as swords. Comp. (Psalms 55:22) “And they are drawn swords (פְּתִיחוֹת).””

Imported from an open dataset — not yet checked against the printed edition.