וְכָל־הַשָּׂרִים֙ וְהַגִּבֹּרִ֔ים וְגַ֕ם כָּל־בְּנֵ֖י הַמֶּ֣לֶךְ דָּוִ֑יד נָ֣תְנוּ יָ֔ד תַּ֖חַת שְׁלֹמֹ֥ה הַמֶּֽלֶךְ׃
Und alle Fürsten und die Mächtigen und alle Söhne des Königs David unterwarfen sich Salomo, dem König.
Ibn Ezra
And behold, the interpretation of bar is "son," as in (Proverbs 31:2): "What, my son (beri), and what, O son (bar) of my womb?" And so it is written [in verse 7], "You are My son (b'ni atah)." And the custom of nations in the world is to place their hands under the hand of the king (like the brothers of Solomon [showing submission, cf. (I Chronicles 29:24)]), or [for] the servant [to place his hand] under the thigh of his master [for an oath, cf. (Genesis 24:2)], or to kiss the king. And this custom [of kissing the ruler] exists until today in the land of India.