From G1909 and the base of G32; to announce upon (reflexively), i.e. (by implication) to engage to do something, to assert something respecting oneself:—profess, (make) promise.
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Strongs concordance
Quoting Genesis 22:16
And said, By myself have I sworn, saith the LORD, for because thou hast done this thing, and hast not withheld thy son, thine only son:
Strongs concordance
Strongs concordance
Strongs concordance
Strongs concordance
Strongs concordance