וְשַׂמְתֶּם֙ אֶת־דְּבָרַ֣י אֵ֔לֶּה עַל־לְבַבְכֶ֖ם וְעַֽל־נַפְשְׁכֶ֑ם וּקְשַׁרְתֶּ֨ם אֹתָ֤ם לְאוֹת֙ עַל־יֶדְכֶ֔ם וְהָי֥וּ לְטוֹטָפֹ֖ת בֵּ֥ין עֵינֵיכֶֽם׃
你們要把我這些話放在心上、存在你們的意念中，把它們繫在你們的手上作為記號，它們要成為你們兩眼之間的經文匣。
Mishnah Sanhedrin
There is greater stringency in respect to the teachings of the scribes than in respect to the torah: [thus,] if [a rebellious elder] says, there is no commandment of tefillin, so that a biblical law may be transgressed, he is exempt. [But if he rules that the tefillin must contain] five compartments, thus adding to the words of the scribes, he is liable.