Goliath is mentioned in the Quran in these verses:
[2:249] When Saul took command of the troops, he said, “God is putting you to the test by means of a stream. Anyone who drinks from it does not belong with me – only those who do not taste it belong with me – unless it is just a single sip.” They drank from it, except a few of them. When he crossed it with those who believed, they said, “Now we lack the strength to face Goliath and his troops.” Those who were conscious of meeting God said, “Many a small army defeated a large army by God’s leave. God is with those who steadfastly persevere.”
[2:250] When they faced Goliath and his troops, they prayed, “Our Lord, grant us steadfastness, strengthen our foothold, and support us against the disbelieving people.”
[2:251] They defeated them by God’s leave, and David killed Goliath. God gave him kingship and wisdom, and taught him as He willed. If it were not for God’s support of some people against others, there would be chaos on earth. But God showers His grace upon the people.
To learn more, read the Quran in English.
Want to study the Quran every week? We provide online Friday meetings every Friday.