Isra'il bin Yonus bin Abi Ishaq إسرائيل بن يونس بن أبي إسحاق · The Book on Marriage

"A man named Abu Shu'aib came to a slave of his, who was a butcher, and said: 'Prepare some food for me that will be sufficient for five, for I have seen hunger in the face of the Messenger of Allah.' So he prepared some food. Then he sent a message to the Prophet inviting him and those who were sitting with him. When the Prophet stood, he was followed by a man who was not with them when they…

The Messenger of Allah said: "When a man has two wives and he is not just between them, he will come on the Day of Judgment with one side drooping."