The singular after the plural in Hosea is deliberate, as Genesis shows

After reading, “They wept and begged me,” and, “Being in the house, they found me,” someone might say that what follows is also, “There it was spoken to them.” That is, to those who wept and begged, and who, being in the house, found God. And from observation of similar sayings we will show that this too has been said consistently.

In Genesis, when God gives a command to Adam, God speaks like this: “From every tree in the garden you may eat as food; but from the tree of the knowledge of good and evil, you shall not eat from it; and on whatever day you eat from it, by death you shall die” (Genesis 2:16-17). For there too, having begun from the singular in saying, “From every tree in the garden you may eat as food,” God brings in the plural, saying, “But from the tree of the knowledge of good and evil, you shall not eat from it; and on whatever day you eat from it, by death you shall die” (Genesis 2:17). For when it concerns the command through which God willed Adam to be in life by keeping it, he commands in the singular, and says, “From every tree in the garden you may eat as food” (Genesis 2:16).