Bible Gateway:
https://www.biblegateway.com/passage/?search=Psalm+119%3A161-168&version=AMP

Bible Hub Commentary Psalm 119:64
https://biblehub.com/commentaries/psalms/119-64.htm
MacLaren's Expositions - Psalms
-A STRANGER IN THE EARTH-
Psalm 119:19, Psalm 119:64.

There is something very remarkable in the variety-in-monotony of this, the longest of the psalms. Though it be the longest it is in one sense the simplest, inasmuch as there is but one thought in it, beaten out into all manner of forms and based upon all various considerations. It reminds one of the great violinist who out of one string managed to bring such music and melody.

The one thought is the infinite preciousness of God’s law, by which, of course, is not meant the written record of that law which lies in Scripture, but the utterances of God’s law in any form, by which men may receive it. You will find that that wider signification of the word ‘law,’ ‘commandment,’ ‘statute,’ is essential to the understanding of every portion of this psalm.