| Barnes' Notes on the Bible 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.
Clarke's Commentary on the BibleLet God be magnified - Let his glory, mercy, and kindness, continually appear in the increase of his own work in the souls of his followers!
Gill's Exposition of the Entire BibleLet all those that seek thee,.... The Targum is, "that seek doctrine (or instruction) from thee.'' rejoice and be glad in thee; the Targum paraphrases it, "rejoice and be glad in thy word.'' and let such as love thy salvation say continually, let God be magnified; the Targum is, "let the glory of the Lord be increased;'' and in Psalm 40:16, instead of "God", it is "the Lord", or "Jehovah": See Gill on Psalm 40:16.
Keil and Delitzsch Biblical Commentary on the Old Testamentויאמרו instead of יאמרו is unimportant. But since the divine name Jahve is now for once chosen side by side with Elohim, it certainly had a strong claim to be retained in Psalm 70:5. Instead of תּשׁועתך we have ישׁועתך here; instead of עזרתי, here עזרי. And instead of אדני יחשׁב לי we have here אלהים חוּשׁה־לּי - the hope is turned into petition: make haste unto me, is an innovation in expression that is caused by the taking over of the לי.
Geneva Study BibleLet all those that seek thee rejoice and be glad in thee: and let such as love thy salvation say continually, Let God be magnified.
Matthew Henry's Concise Commentary70:1-5 The speedy destruction of the wicked, and the preservation of the godly. - This psalm is almost the same as the last five verses of #Ps 40". While here we behold Jesus Christ set forth in poverty and distress, we also see him denouncing just and fearful punishment on his Jewish, heathen, and antichristian enemies; and pleading for the joy and happiness of his friends, to his Father's honour. Let us apply these things to our own troubled circumstances, and in a believing manner bring them, and the sinful causes thereof, to our remembrance. Urgent trials should always awake fervent prayers. | 
