As a matter of fact no where the Authors of Bible said they are writing "literal" historical fact.
They said all scriptures are inspired by God.
Dear Peg, in other places in Bible (Hebrew and NT) the expression being in "tomb" has also been used in a symbolic way. Meaning being dead in the Tomb of sinful desires.
That Lazare was sick, also can mean, a spritual disease, in a sense that he had a desease of heart. Or impurity of the soul due to being sinful.
In another words, the scripture symbolically is talking about the "Spirit" of Laz. that was sick due to being sinfull, and He was dead and burried in the Tomb of sin and selfish desire.
When Jesus went to him after a few days, He resurrected him by teaching Him the Truth, and giving him Faith.
I think One of the key verses to interprete this story is this verse:
John 11:4 "When Jesus heard that, he said, This sickness is not unto death, but for the glory of God, that the Son of God might be glorified thereby."
Now we need to carefully analyze what the "Authors" of Bible meant by "gloryfying God", not what we think "glorifying" means.
For that we can refer to other verses which are the key:
Mat. 5:16 "Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven."
and
John 15:8 "Herein is my Father glorified, that ye bear much fruit"
Thus it becomes clear that, according to the Authors of Bible, when the followers of Christ become fruitful and do good works and become rigtous, that Glorifies God. Not performing literal Miracles as many would imagine, even as Jesus rejected to do any literal and physical Miracles:
"He sighed deeply and said, "Why does this generation ask for a sign? Truly I tell you, no sign will be given to it." Mark 8:12
Being witness, is also mean those who witnessed that Laz. was a sinful man, but later he became a rightous man (he was dead, then he became alive). Just like the son of the old man, who others were also witness in that party...
Now since Laz. was dead in sin, spiritually sick in the eyes of others, and when Jesus made him spiritually alive, by this God was glorified,
"This sickness is not unto death, but for the glory of God"