Talmud for Megillah 48:29

HALAKHAH: Rebbi Yose ben Bevai stated: Square [black]¹⁵³Corrector’s addition, of unknown source. The Babli only declares black strips as practice from Moses on Sinai. tefillin are practice from Moses on Sinai¹⁵⁴Babli 24b, Šabbat 28b, Menaḥot 35a..