Sayyiduna Samurah bin Jundub (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him): "When two guardians give (a woman) in marriage, the marriage by the first guardian is valid; and when a man sells his goods to two men, the goods belong to the first buyer."
This is how the group (of narrators) narrated it, and it is the preserved (mahfuz) version.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13795