(c) He asked life of thee, [and] thou gavest [it] him, [even] length of days for ever and ever.
(c) David not only obtained life, but also assurance that his posterity would reign forever.
Related Commentaries of Psalms 21:4
Psalms 21:4
4 He asked life of thee, and thou gavest it him, even length of days for ever and ever.