Genesis 38:15-19

Verse 15

Thought her to be a harlot - See the original of this term, Gen 34:31 (note). The Hebrew is זונה zonah, and signifies generally a person who prostitutes herself to the public for hire, or one who lives by the public; and hence very likely applied to a publican, a tavern-keeper, or hostess, Jos 2:1; translated by the Septuagint, and in the New Testament, πορνη, from περναω, to sell, which certainly may as well apply to her goods as to her person.

It appears that in very ancient times there were public persons of this description; and they generally veiled themselves, sat in public places by the highway side, and received certain hire. Though adultery was reputed a very flagrant crime, yet this public prostitution was not; for persons whose characters were on the whole morally good had connections with them. But what could be expected from an age in which there was no written Divine revelation, and consequently the bounds of right and wrong were not sufficiently ascertained? This defect was supplied in a considerable measure by the law and the prophets, and now completely by the Gospel of Christ.
Verse 17

Wilt thou give me a pledge till thou send it? - The word ערבון erabon signifies an earnest of something promised, a part of the price agreed for between a buyer and seller, by giving and receiving of which the bargain was ratified; or a deposit, which was to be restored when the thing promised should be given. St. Paul uses the same word in Greek letters, αρῥαβων, 2Cor 1:22; Eph 1:14. From the use of the term in this history we may at once see what the apostle means by the Holy Spirit being the Earnest, αρῥαβων, of the promised inheritance; viz., a security given in hand for the fulfillment of all God's promises relative to grace and eternal life. We may learn from this that eternal life will be given in the great day to all who can produce this erabon or pledge. He who has the earnest of the Spirit then in his heart shall not only be saved from death, but have that eternal life of which it is the pledge and the evidence. What the pledge given by Judah was, see on Gen 38:25 (note).
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