Isma'il bin Ayyash bin Saleem إسماعيل بن عياش بن سليم · The Chapters on Marriage

Ibn Umar said: “The Messenger of Allah forbade Shighar. Shighar is when a man says to another man: 'Marry your daughter or sister to me, on condition that I will marry my daughter or sister to you,' and they do not give any dower (i.e. neither of them give other the dower).”

“The worst of food is food of a wedding feast to which the rich are invited and the poor are not. Whoever does not accept an invitation has disobeyed Allah and His Messenger.' ”

“The Messenger of Allah said: “A man should not be married to a woman and her paternal aunt or maternal aunt at the same time.”