PSALM 137 Fear Our God

In Psalm 135,  a psalm of praise, we read in verse 8;-
                      He destroyed the firstborn of Egypt
                      Both man and beast.
In Psalm 136:10, we sing again,
                       To Him who struck Egypt in their firstborn.
                             and in verse 15,
                        He swept Pharaoh and his army
                        into the red sea.
In Psalm 137  the psalmist asks God to punish the babylonians;-
                        Happy the one who repays you
                        as you have served us!

In The New testament the word of God warns us
not to take vengeance into our own hands.
Romans 12: 19 ESV
                        Beloved, never avenge yourselves
                        but leave it to the wrath of God.
                        for it is written,
                        "Vengeance is mine, I will repay"
                        says the Lord.......

Those who would oppress the people of God,
Those who kill and destroy the people of God,
need to know;-
Psalm 9:13 NCV
                        For the avenger of blood remembers them;
                        he does not ignore the cry of the afflicted.

Psalm 9:11-12 NKJV
                         Sing praise to the LORD who dwells in Zion !
                         Declare his deeds among the people.
                         When He avenges blood,
                         He remembers them
                         He does not forget the cry of the humble.

Matthew 25:40 NKJV
                          Assuredly, I say to you, inasmuch as you did it
                          to one of the least of these My brethren,
                          you did it to Me.

People of God who have known only relative  peace and prosperity
in their own experience, need to know that when circumstances change
they may join the psalmist to pray
Psalm 140 NKJV
                       1  Deliver me, O LORD, from evil men
                       4  Keep me O LORD, from the hands of the wicked.
                      12 I know that the LORD will maintain
                           the cause of the afflicted
                           And justice for the poor.

Psalm 111:10 NKJV
                           The fear of the LORD
                           is the beginning of wisdom.