גַּם־שָׁ֭ם יָדְךָ֣ תַנְחֵ֑נִי וְֽתֹאחֲזֵ֥נִי יְמִינֶֽךָ׃
Naroon man, ang Iyong kamay ang papatnubay sa akin, at hahawakan ako ng Iyong kanang kamay.
Mekhilta DeRabbi Shimon Ben Yochai
"That the Torah of the Lord be in thy mouth" -- to exclude women [from tefillin]. What is exemplary about tefillin? They are a positive time-triggered commandment from which women are exempt. So too, are women exempt from all positive time-triggered commandments.