It is narrated from Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) gave them eighty lashes each.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19566
It is narrated from Sayyidah Aishah (may Allah be pleased with her); she said: When my vindication was revealed, the Messenger of Allah (peace and blessings be upon him) stood on the pulpit, mentioned it and recited the Qur'an. When he (peace and blessings be upon him) came down from the pulpit, he gave orders concerning two men and a woman, and the prescribed punishment (hadd) was carried out on them.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19567
Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) said: "When it is the Day of Resurrection, Allah will carry out the prescribed punishment of eighty lashes each on those who reviled Aishah, before all of creation. Then my Lord will ask me to pardon the Muhajirun among them, so I will consult you, O Aishah." Sayyidah Aishah (may Allah be pleased with her) heard these words while she was in the house, and she began to weep. Then she said: By the One who sent you as a Prophet with the truth, your happiness is dearer to me than my own happiness. At this the Messenger of Allah (peace and blessings be upon him) smiled and said: "She is her father's daughter."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19568