בָּר֣וּךְ הַ֭בָּא בְּשֵׁ֣ם יְהוָ֑ה בֵּ֝רַֽכְנוּכֶ֗ם מִבֵּ֥ית יְהוָֽה׃
Blessed be he that cometh in the name of the LORD; We bless you out of the house of the LORD.
Read kabbalistic (mystical) interpretation of Psalms 118:26: and classical mystical sources.