The Prophet ﷺ said: Any woman who is married by two guardians (to two different men) belongs to the first woman who is married by two guardians (to two different men) belongs to the first of them and anything sold by a man to two persons belongs to the first of them. (Using translation from Abū Dāʾūd 2088)  

قَالَ رَسُولُ اللهِ ﷺ «أَيُّمَا امْرَأَةٍ زَوَّجَهَا وَلِيَّانِ فَهِيَ لِلْأَوَّلِ مِنْهُمَا وَأَيُّمَا رَجُلٍ بَاعَ بَيْعًا مِنْ رَجُلَيْنِ فَهُوَ لِلْأَوَّلِ»  

[Machine] The Messenger of Allah ﷺ said, "When a woman is married, her guardian is for the first one."  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِذَا أُنْكِحَ وَلِيَّانِ فَهُوَ لِلْأَوَّلِ»