“it is appointed unto men once to die, but after this the judgment:” Heb. 9:27
I believe that could explain these NDE cases, which would be supported if these people spoke about some sort of Jesus experience, and further supported if there was a change of heart in that person to Jesus.
I think it’s wise to test them, if necessary, but also to keep your heart open and your ego small, so as to not become as the Pharisees were, with no room in your understanding for what the Holy Spirit will teach you and to not miss a miracle of God.
Explain Lazarus.
Christians believe that Christ brought people back to life. Any reports from the Old Testament? As to the quote from Hebrews, I will leave that to others discuss if they choose.