Matthew 27:47 and Mark 15:35.
Some bystanders were attempting to explain what Jesus said, and they were mistaken. How does it follow that scripture is supporting prayer to the dead by recording what some mistaken bystanders said? Scripture also records accusations that Jesus was a sinner and was empowered by Satan.
The Bible covers thousands of years of history and a wide variety of contexts within that history. There are hundreds of passages on prayer. What should we think when people who believe in praying to the dead resort to passages like Matthew 27:47 to try to justify the practice?
And notice that Lvka doesn't even attempt to address the Biblical and patristic evidence I cited in my article. I mentioned sources like Origen and Cyprian, and others could be cited (Irenaeus, Lactantius, etc.).