Record them from the age of thirty years up to the age of fifty, all who are subject to service in the performance of tasks for the Tent of Meeting.
הבא לצבא צבא. פירוש צבא חברת אנשים המשתתפים יחד לעמוד במשרת עבודתם. (פעראיין) וטעם לצבא צבא, כל הבא להיות שותף החברה.
Who are subject to service. The explanation of "service" is a group of men who join together to stand in service. And the meaning of "who are subject to service" means all of those who are able to join the group.
Remove male and female alike; put them outside the camp so that they do not defile the camp of those in whose midst I dwell.
Speak to the Israelites: When a man or woman commits any wrong toward a fellow man, thus breaking faith with the LORD, and that person realizes his guilt,
וטעם מכל חטאת האדם...ואמר בכאן איש או אשה מפני שאין דרך האשה לגזול ואולי לא יחייב אותה הכתוב בחומש ואשם כאיש
And the meaning behind any wrong toward a fellow man...And the text says here "a man or a woman" because it is not the way of a woman to steal and if she does, she is not obligated by the text to pay the restitution [like a man].
Speak to the Israelite people and say to them: If any man’s wife has gone astray and broken faith with him
איש איש — The double expression איש איש is employed to teach you that she (the faithless wife) deals treacherously in two respects — against Him above Who bears the appelation of איש, as in the text "[the Lord is] a Man of the war” (Exodus 15:3), and against her husband (אישה) here below (Midrash Tanchuma, Vaetchanan 5).
but a fit of jealousy comes over him and he is wrought up about the wife who has defiled herself; or if a fit of jealousy comes over one and he is wrought up about his wife although she has not defiled herself—
Etz Chayim Humash Commentary on Numbers 5:14
It would seem that the Sages understood the ordeal of the sotah less as a way of ferreting out adulteresses and more as a way of "proving" to the husband that his suspicions were groundless. A man who might not be satisfed with a court's finding of "not guilty in the absence of proof" would have to accept the judgment of Heaven. Because it is unlikely that the ritual would produce a guilty verdict (unless through the psychosomatic reaction of a truly guilty wife), its purpose may well have been to alleviate the husband's suspicion and restore domestic harmony.
We can understand the promise of verse 28, that if the woman is found innocent, she will be able to "retain seed," as foreseeing that she will be restored to a life of love with her husband. But even if the ordeal and a subsequent pregnancy turn the husband's heart back to his wife, what will it take to restore her trust in him and affection for him?
(28) But if the woman has not defiled herself and is pure, she shall be unharmed and able to retain seed.