Matthew 2:9-12
"After listening to the king, they [the wise men] went on their way. And behold, the star that they had seen when it rose went before them until it came to rest over the place where the child was. When they saw the star, they rejoiced exceedingly with great joy. And going into the house they saw the child with Mary his mother, and they fell down and worshipped him. Then, opening their treasures, they offered him gifts, gold and frankincense and myrrh. And being warned in a dream not to return to Herod, they departed to their own country by another way."
Gold
Represents Jesus' divinity.
It was also probably used by Joseph and Mary when they went into Egypt to await the death of Herod the Great.
Frankincense
Represents Jesus' holiness.
It was often burned as a fragrant offering to God.
Myrrh
Represents Jesus' suffering.
It was often used in the embalming process. This may also have been useful when Joseph and Mary went to Egypt.