If verse 1 strikes the keynote of the psalm as far as God is concerned, crying, "Give thanks to the LORD, for he is good; his love endures forever,” verse 6 strikes the keynote as far as the people are concerned. It has to do with Israel's sin and is a confession of it: “We have sinned, even as our fathers did; we have done wrong and acted wickedly.” 

When I end a sermon, I like to end on a strong note, with a bang rather than a whimper, and generally I like to end a book or a lecture or anything else in the same way. I would expect this as we come to the end of the fourth book of the Psalter, but it is not what we find. True, the psalm is not exactly a whimper. But it is hardly a bang either. For the most part it is a long litany of the sins of Israel for which God chastised them again and again. In fact, if verse 47 is an accurate clue to when the psalm was written—“Save us, O LORD our God, and gather us from the nations”—the people seem to be in exile, and the final "Amen” ("Let all the people say, 'Amen!’,” v. 48) is a recognition, in part at least, that God was right in having judged them as he did.

As we saw in yesterday’s study, in order to understand the plagues against Egypt we need to know that they were intended to show the superiority of the God of Israel to the Egyptian gods. The first two plagues were against the gods of the Nile. The next four were against the land gods. The final four plagues, which we will look at today, were directed against the gods of the sky.

For some reason—we do not know why—Psalm 105 changes the order of the plagues somewhat and omits two. This listing begins with the ninth plague (the great darkness). Then it reverts to the original sequence, except that it inverts the order of the third and fourth plagues (gnats and flies, here flies and gnats) and omits the fifth and sixth plagues entirely (the death of the livestock and the boils).

The most interesting part of the historical section of Psalm 105 is the fourth stanza (vv. 16-36), for it tells us about Israel's time in Egypt and the exodus from it. In telling about Joseph it introduces details that we do not find in Genesis. Genesis emphasizes Joseph's character and spirit of service. In Psalm 105 the stress is on his cruel treatment.