Where in the Bible? In Psalm 103 we pray, “Bless the Lord, O you his angels, you mighty ones who do his word, hearkening to the voice of his word! Bless the Lord, all his hosts, his ministers that do his will!” Psalms 148 we pray, “Praise the Lord! Praise the Lord from the heavens, praise him in the heights! Praise him, all his angels, praise him, all his host!”
In Rev. 5:8 the saints in heaven offer to God the prayers of the saints on earth. In Rev. 8:3–4, the angels do the same thing. In Matt. 18:10, Jesus spoke of the angels ability to intercede for the children to God. One more, James 5:16 where he speaks of the prayers of the righteous. Those in heaven before us are righteous.
I can give you examples of the early Church Fathers, too, that show their belief in prayers to those in Heaven as early as 50 years after Jesus’ death. I’m sure that this will only get us back to the same disagreement as to the interpretation of Scriptures. And I know it is just us Catholics that read the Church Fathers and follow the Tradition handed down but it helps me to see what those that lived so close to the time of Christ on earth believed. It just strengthens my faith as I read the bible and compare it to the lives of the saints.
There's nothing in the passage in Revelation that indicates that the saints in heaven were being prayed to.
Those in heaven before us are righteous.
Those on earth in Christ Jesus are righteous. Born again believers have the righteousness of Christ imputed to them so God sees them as righteous as He sees Jesus.