Albert Barnes Commentary Psalms 79:9

"Help us, O God of our salvation, for the glory of thy name; And deliver us, and forgive our sins, for thy name`s sake." — Psalms 79:9 (ASV)

Help us, O God of our salvation - On whom our salvation depends; who alone can save us.

For the glory of your name - That your name may be honored. We are your professed people; we have been redeemed by you; and your honor will be affected by the question whether we are saved or destroyed. It is the highest and purest ground for prayer, that the glory or honor of God may be promoted. See the notes at (Matthew 6:9), notes at (Matthew 6:13); notes at (John 12:28); notes at (Daniel 9:19).

And deliver us - From our enemies.

And purge away our sins - Forgive our sins, or cleanse us from them. The original word is the one commonly used to denote an atonement. Compare in the Hebrew, (Daniel 9:24); (Ezekiel 45:20); (Exodus 30:15); (Exodus 32:30); (Leviticus 4:20); (Leviticus 5:26); (Leviticus 16:6), (Leviticus 16:11), (Leviticus 16:24).

For your name’s sake - See the notes at (Daniel 9:19).