The iniquity of Ephraim is bound up; his sin is hid. This verse is in tended to remove all doubt about the punishment of sin, whatever interval may have elapsed. The day of reckoning would certainly come, for the sin of Ephraim was neither forgotten nor blotted out.
As a miser puts his money in a bag and seals it to prevent it being lost, so the Almighty had, as it were, hoarded Ephraim's sin, putting it in a bag and tying it. A parallel expression occurs in Job 14:17," My transgression is sealed up in a bag, and thou sewest up mine iniquity."
Usually when men put money into a bag, purse, or treasure-house, they count it; so the sins of Ephraim were reckoned, laid up in the treasury of wrath, till the amount should be full and the day of reckoning arrive.
The sinner himself is represented as treasuring up unto himself wrath against the day of wrath. Aben Ezra only remarks on the place where it is treasured: "It is bound up in my heart; I shall not forget it as they have forgotten me, as is written above" (verse 6, "They have forgotten me").