וַיֹּ֤אמֶר יְהוָה֙ אֶֽל־אַהֲרֹ֔ן לֵ֛ךְ לִקְרַ֥את מֹשֶׁ֖ה הַמִּדְבָּ֑רָה וַיֵּ֗לֶךְ וַֽיִּפְגְּשֵׁ֛הוּ בְּהַ֥ר הָאֱלֹהִ֖ים וַיִּשַּׁק־לֽוֹ׃
And the LORD said to Aaron: ‘Go into the wilderness to meet Moses.’ And he went, and met him in the mountain of God, and kissed him.
Read kabbalistic (mystical) interpretation of Exodus 4:27: and classical mystical sources.