See: Amarna letters for the phrase "7 times and 7 times".

Biridiya letter 246, no. 5 of 7: title: "The sons of Lab'ayu"

:Say to the king, my lord and my Sun: Message of Biridiya, your loyal servant. I fall at the feet of the king, m[y] lord and my Sun, 7 times and 7 times.
:I have heard the mes[sage] o[f] the ki[ng ...] .... (lacuna)

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