Saith for speaketh, A.V.; he held for foresaw, A.V. The sixteenth psalm is ascribed to David in the title prefixed to it in the Hebrew and the LXX. Without pronouncing the titles to be infallible, we must confess that they carry great weight with them in the absence of any strong internal evidence against them.
Meyer speaks of the psalm as "certainly later than David," and Ewald and others ascribe it to the time of the Captivity; but Hitzig thinks the internal evidence is in favor of its belonging to the time before David ascended the throne ('Speaker's Commentary').
We may safely rest on the authority of St. Peter hero and St. Paul (Acts 13:35, Acts 13:36), and be satisfied that it is really David's. The manner in which it is quoted by the two apostles is also very strong evidence that by the Jews of that day it was generally admitted to be a Messianic psalm.
The following quotation is verbatim from the LXX.