פירוש על יחזקאל 44:22

but...virgins may the High Priests take. But there are some priests who may take a widow, namely, the ordinary ones, and this is the meaning of “some of the priests may marry”; there are some priests who are permitted to marry a widow.

who is only a widow A real [widow], excluding a divorcee and a woman upon whom the rite of chalitzah was performed; although she is unmarried, she is forbidden even for an ordinary [priest].