Hosea 1:2

These words, The beginning of the word of the Lord by Hosea, may refer either, 1. To that glorious set of prophets which was raised up about this time. About this time there lived and prophesied Joel, Amos, Micah, Jonah, Obadiah, and Isaiah; but Hosea was the first of them that foretold the destruction of Israel; the beginning of this word of the Lord was by him. We read in the history of this Jeroboam here named (Kg2 14:27) that the Lord had not yet said he would blot out the name of Israel, but soon after he said he would, and Hosea was the man that began to say it, which made it so much the harder task to him, to be the first that should carry an unpleasing message and some time before any were raised up to second him. Or, rather, 2. To Hosea's own prophecies. This was the first message God sent him upon to this people, to tell them that they were an evil and an adulterous generation. He might have desired to be excused from dealing so roughly with them till he had gained authority and reputation, and some interest in their affections. No; he must begin with this, that they might know what to expect from a prophet of the Lord. Nay, he must not only preach this to them, but he must write it, and publish it, and leave it upon record as a witness against them. Now here, I.

— Matthew Henry's Concise Commentary (public domain)

beginning--not of the prophet's predictions generally, but of those spoken by Hosea. take . . . wife of whoredoms--not externally acted, but internally and in vision, as a pictorial illustration of Israel's unfaithfulness [HENGSTENBERG]. Compare Eze 16:8, Eze 16:15, &c. Besides the loathsomeness of such a marriage, if an external act, it would require years for the birth of three children, which would weaken the symbol (compare Eze 4:4). HENDERSON objects that there is no hint of the transaction being fictitious: Gomer fell into lewdness after her union with Hosea, not before; for thus only she was a fit symbol of Israel, who lapsed into spiritual whoredom after the marriage contract with God on Sinai, and made even before at the call of the patriarchs of Israel. Gomer is called "a wife of whoredoms," anticipatively. children of whoredoms--The kingdom collectively is viewed as a mother; the individual subjects of it are spoken of as her children. "Take" being applied to both implies that they refer to the same thing viewed under different aspects. The "children" were not the prophet's own, but born of adultery, and presented to him as his [KITTO, Biblical CyclopÃ&brvbrdia]. Rather, "children of whoredoms" means that the children, like their mother, fell into spiritual fornication. Compare "bare him a son" (see Hos 2:4-5). Being children of a spiritual whore, they naturally fell into her whorish ways.

— Jamieson-Fausset-Brown Commentary (public domain)