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“The 108th psalm is altogether made up of extracts from the others; its first part being identical (with the exceptions of a few slight variations) with the third division of the 57th; its second, with the second division of the 60th. And both these borrowed parts are discriminated, both in the 57th and 60th psalms, from the rest of the context by the word Selah. This is a remarkable fact, and illustrates strongly one of the functions of the Diapsalma. These parts were, then, to a certain degree, regarded as distinct compositions, which occasionally were disjointed from their original context; the very change of sentiment and strain, which originated the word Diapsalma, sanctioning such an occasional practice.” — Jebb’s Literal Version of the Book of Psalms, with Dissertations, volume 2, page 109.