Related for Berakhot 40:5
וחייבין בתפלה: דרחמי נינהו מהו דתימא הואיל וכתיב בה (תהלים נה, יח) ערב ובקר וצהרים כמצות עשה שהזמן גרמא דמי קמ"ל:
But they are under the obligation of Tefillah ; [obviously] because this is prayer! [not translated] But thou mightest say that since it is written thereby, "Evening and morning and at noonday" (Ps. lv. 18), it is like a command the observance of which depends upon a certain point of time [and women are exempt]; therefore it informs us [the obligation is theirs].
Tosefta Berakhot
Women, slaves and children are exempt [from saying Birkat Hamazon (Grace After Meals)], and they cannot absolve many [people, who include men] from their obligation [of saying Birkat Hamazon]. In reality, they (i.e. the Rabbis) said that a woman can say [Birkat Hamazon] for her husband, a son can say [Birkat Hamazon] for his father, [and] a slave can say [Birkat Hamazon] for his master.
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