It was narrated from Sammurah that the Messenger of Allah said:

"If a woman is married off by two guardians, then the first marriage is the one that counts, and if a man sells something to two men, it belongs to the first one."

أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا غُنْدَرٌ، عَنْ شُعْبَةَ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ سَمُرَةَ، أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ " أَيُّمَا امْرَأَةٍ زَوَّجَهَا وَلِيَّانِ فَهِيَ لِلأَوَّلِ مِنْهُمَا وَمَنْ بَاعَ بَيْعًا مِنْ رَجُلَيْنِ فَهُوَ لِلأَوَّلِ مِنْهُمَا " .