Numbers 5:19

19 `And the priest hath caused her to swear, and hath said unto the woman, If no man hath lain with thee, and if thou hast not turned aside [to] uncleanness under thy husband, be free from these bitter waters which cause the curse;

Numbers 5:19 Meaning and Commentary

Numbers 5:19

And the priest shall charge her by an oath
Or give her her oath:

and say unto the woman, if no man hath lain with thee:
besides her husband:

and thou hast not gone aside to uncleanness [with another] instead of
thy husband;
which is but another phrase expressive of the same thing, the sin of adultery:

be thou free from this bitter water that causeth the curse;
if this is the case, it shall produce no bitter effects, or bring any curse upon thee.

Numbers 5:19 In-Context

17 and the priest hath taken holy water in an earthen vessel, and of the dust which is on the floor of the tabernacle doth the priest take, and hath put [it] into the water,
18 and the priest hath caused the woman to stand before Jehovah, and hath uncovered the woman's head, and hath given into her hands the present of the memorial, it [is] a present of jealousy, and in the hand of the priest are the bitter waters which cause the curse.
19 `And the priest hath caused her to swear, and hath said unto the woman, If no man hath lain with thee, and if thou hast not turned aside [to] uncleanness under thy husband, be free from these bitter waters which cause the curse;
20 and thou, if thou hast turned aside under thy husband, and if thou hast been defiled, and any man doth give his copulation to thee besides thy husband --
21 (then the priest hath caused the woman to swear with an oath of execration, and the priest hath said to the woman) -- Jehovah doth give thee for an execration, and for a curse, in the midst of thy people, in Jehovah's giving thy thigh to fall, and thy belly to swell,
Young's Literal Translation is in the public domain.