נִשְׁבַּֽע־יְהוָ֨ה ׀ לְדָוִ֡ד אֱמֶת֮ לֹֽא־יָשׁ֪וּב מִ֫מֶּ֥נָּה מִפְּרִ֥י בִטְנְךָ֑ אָ֝שִׁ֗ית לְכִסֵּא־לָֽךְ׃
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Likutei Moharan
2. And this weapon must be received by the way of Yosef, that is, keeping the brit/Covenant [particularly the brit Avraham, i.e. circumcision i.e. taharat mishpachah/family purity related matters], as written (there, 45): "Gird your sword upon your thigh." And as written (there, 132): "From the fruit of your belly will I seat upon your throne…" this is the aspect of Mashiach, like prayer. And "…if your children will keep My covenant" — that is, by the way of Yosef.