בְּיָמָיו֙ תִּוָּשַׁ֣ע יְהוּדָ֔ה וְיִשְׂרָאֵ֖ל יִשְׁכֹּ֣ן לָבֶ֑טַח וְזֶה־שְּׁמ֥וֹ אֲֽשֶׁר־יִקְרְא֖וֹ יְהוָ֥ה ׀ צִדְקֵֽנוּ׃ (ס)
In his days Judah shall be saved, and Israel shall dwell safely; and this is his name whereby he shall be called, the LORD is our righteousness.
Read kabbalistic (mystical) interpretation of Jeremiah 23:6: and classical mystical sources.