(CNN) -- He claimed he won the prize this week, and now it's official: Pedro Quezada of New Jersey is the winner of Saturday's $338 million Powerball jackpot, the New Jersey Lottery said Tuesday. Quezada announced on Monday that he held the winning ticket, but the final word from lottery officials didn't come until Tuesday. "I felt pure joy, just happiness," Quezada, a Dominican immigrant and deli owner, told reporters at a news conference Tuesday. "It's a gift from God," he said. Undoubtedly, his life will change. But the money "won't change my heart," Quezada said. He said he was walking to work Monday and saw a crowd at a liquor store in Passaic, New Jersey. He'd bought his Powerball ticket there, so he thought he should go in to see who won. He had his ticket with him, and showed it to the clerk, who checked it and told him he was the winner.
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NEW: Pedro Quezada says the money is a "gift from God"
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NEW: It'll change his life, but not his heart, says the Dominican immigrant and deli owner
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NEW: Quezada moved to the United States when he was 19
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NEW: He has five children, ages 5-23, and one granddaughter
Quezada's ticket matched all six numbers drawn Saturday night: 17, 29, 31, 52, 53 and the @placeholder, 31.