וְלֹ֤א אָֽמְר֨וּ ׀ הָעֹבְרִ֗ים בִּרְכַּֽת־יְהוָ֥ה אֲלֵיכֶ֑ם בֵּרַ֥כְנוּ אֶ֝תְכֶ֗ם בְּשֵׁ֣ם יְהוָֽה׃
Neither do they that go by say: ‘The blessing of the LORD be upon you; We bless you in the name of the LORD.'
Read kabbalistic (mystical) interpretation of Psalms 129:8: and classical mystical sources.