Sefer HaMitzvot, Positive Commandments
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היא שצונו להניח תפילין של ראש והוא אמרו והיו לטוטפות בין עיניך. וכבר נכפל זה הצווי ארבע פעמים. (בפ' בוא ואתחנן עקב, אהבה הלכות תפילין ומזוזה פ"א):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded us to put on the head tefillin. And that is His saying, "and they shall be for symbols between your eyes" (Deuteronomy 6:8). And this command has already been repeated four times. (See Parashat Bo, Vaetchanan and Ekev; Mishneh Torah, Tefillin, Mezuzah and the Torah Scroll 1.)