Sayyiduna Urwah bin Mas'ud al-Thaqafi (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) used to have water with him, and when he took the pledge of allegiance from women, the women would dip their hands in the water.
Al-Tabarani recorded it; its chain contains a narrator, Abdullah bin Hakim Abu Bakr al-Dahiri, who is da'if (weak).