Five Biblical Arguments for Praying to Saints and Angels

I wanted to make this list of arguments for praying to the saints and angels because I think it's very useful to have a single "reference-sheet" for discussions where you are dealing with Protestants. This page has passages where prayers are made to the angels and saints and passages that support the concept in secondary ways.
1) “Bless the Lord, O you his angels” (Psalms 103:20) “Bless the Lord, all his hosts” (Psalms 103:21) “Praise him, all his angels” -- “Praise him, all his host” (Psalms 148:1-2) “Rejoice over her, O heaven, O saints and apostles and prophets.” (Revelation 18:20)
These verses show that we can address the saints and angels in heaven when we pray. The difference between the prayer, “Bless the Lord, all his hosts” and “Pray for me, all his hosts” is only the difference between two kinds of prayer. Either way you are addressing the people in heaven, it’s just that if you pray the first way, you’re asking the saints to pray with you, and if you pray the second way, you’re asking the saints to pray for you.
2) “[T]he twenty-four elders fell down before the Lamb...[with] incense, which [is] the prayers of the saints.” (Revelation 5:8) “And another angel came...and he was given much incense to [offer] with the prayers of all the saints.” (Revelation 8:3)
These verses tell us two things about the saints in heaven. First, they have our prayers and they bring them before God. This shows that they’ve received them. The “incense” of prayer rises to the saints according to this passage. That shows the saints being prayed to at the very least by some people. Second, the saints in heaven are praying about our prayers. People don’t fall down before God for nothing. Rev. 8:3 makes this clearer by saying that incense-prayer from heaven was added to the incense-prayer from earth. This shows us that the saints in heaven add their prayers to ours. Therefore, they receive our prayers, present them to God, and join their prayers to ours.
3) “[Jacob] strove with the angel and prevailed, [then] he wept and sought his favor.” (Hosea 12:4) “[T]he angel who has redeemed me from all evil, bless the lads.” (Genesis 48:16)
These passages show angels being prayed to. Jacob prayed to an angel for his favor and then later asks him to bless his children. The Hosea passage is clarified by Genesis 32:24-29, where Jacob says to the angel, “I will not let you go, unless you bless me.” Some people argue that the angel was actually God because in verse 30 Jacob says, “I have seen God face to face,” but Hosea 12:4 says it was an angel. Genesis 32:30 could mean that Jacob thought the angel was God, or understood that angels bear with them the real presence of God. It is also significant that God has no body. That means the reference to His face is symbolic. It refers to God’s presence.
4) “[A]t your right hand stands the queen in gold of Ophir. Hear, O daughter, consider, and incline your ear; forget your people and your father’s house; and the king will desire your beauty. Since he is your lord, bow to him; the people of Tyre will sue your favor with gifts, the richest of the people with all kinds of wealth.” (Psalms 45:9-13)
This passage is in a messianic psalm and discusses the woman who will stand at the right hand of the Messiah. The woman is Mary and it says specifically that the people of faraway nations “will sue [her] favor with gifts.” This passage shows us that Mary can be prayed to, but it’s also significant because it is a prophecy that is only fulfilled in the Catholic Church. Protestant churches don’t even claim that there is a woman who all the nations seek for her favor, but the Bible says there would be, and she would stand at the right hand of the Messiah.
5) “Grace to you and peace from him who is, and was, and is to come, and from the seven spirits which are before his throne.” (Revelation 1:4)
In this passage St. John invokes a blessing upon the churches in Asia. He did not only invoke grace from God, but from angels. An invocation is a form of prayer which calls down a blessing on someone. In this passage he calls it down from God and seven angels, which shows us a prayer to the angels.