גַּם־שָׁ֭ם יָדְךָ֣ תַנְחֵ֑נִי וְֽתֹאחֲזֵ֥נִי יְמִינֶֽךָ׃
就是在那裡，你的手也必引導我，你的右手也必扶持我。
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.