Nicodemus and Joseph of Arimathea are interesting characters in the gospel story.
Nicodemus was a Pharisee and member of the Jewish ruling counsel (John 3:1) whose heart had been stirred by Jesus.
“He came to Jesus at night and said, ‘Rabbi, we know that you are a teacher who has come from God. For no one could perform the signs you are doing if God were not with him.” – John 3:2
“Many have undertaken to draw up an account of the things that have been fulfilled among us, just as they were handed down to us by those who from the first were eyewitnesses and servants of the word. With this in mind, since I myself have carefully investigated everything from the beginning, I too decided to write an orderly account for you, most excellent Theophilus, so that you may know the certainty of the things you have been taught.” – Luke 1:1-4
Luke took on the role of an investigative journalist. He looked into “everything from the beginning” and spoke with “eyewitnesses” so that he could lay down “an orderly account” for Theophilus and in turn us. That he and now we could “know the certainty of the things [we] have been taught.”