Albert Barnes Commentary Psalms 70:4

"Let all those that seek thee rejoice and be glad in thee; And let such as love thy salvation say continually, Let God be magnified." — Psalms 70:4 (ASV)

Let all those that seek thee ... - The only change in this verse from Psalm 40:16, is in the insertion of the word and in the beginning of the second clause - and let such as love, etc.