Some argue that the Bible is contradictory concerning whether the wine that was given to Jesus on the cross was mixed with gall or myrrh. The argument is that Matthew 27:34 says that it was mixed with gall, but Mark 15:23 says that it was mixed with myrrh. However, there is a reasonable explanation that solves this alleged contradiction in the Bible
offered him wine to drink, mixed with gall, but when he tasted it, he would not drink it.Matthew 27:34
And they offered him wine mixed with myrrh, but he did not take it.Mark 15:23
Myrrh is an aromatic gum that is used to sweeten the smell and taste of various foods. It is likely that the wine already had myrrh mixed in, and then gall was added later. Or, alternatively, both gall and myrrh were mixed in with the wine.
In any case, there is simply no necessary contradiction between Matthew 27:34 and Mark 15:23.
To read more answers to alleged and apparent contradictions in the Bible, see “Contradictions” in the Bible Answered.
These books are also excellent resources: