It is narrated from Nafi', the freed slave of Ibn Umar (may Allah have mercy on him), that a man asked Sayyiduna Abdullah bin Umar (may Allah be pleased with them both), saying: "My maternal uncle has divorced his wife and separated from her, and because of this he is deeply grieved and it has weighed heavily upon him. So I intended to marry that woman (so that she would become lawful for her first husband), although my uncle has neither ordered me to do so nor does he know about it?" Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: "No, do not do so, unless you make a marriage of genuine desire and liking; then if she pleases you, keep her in your marriage, and if you dislike her, separate from her. Otherwise (if the intention is only tahlil), we used to count this as fornication in the time of the Messenger of Allah (peace and blessings be upon him)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Umar bin Nafi' (may Allah have mercy on him) except Abu Ghassan (may Allah have mercy on him)."
Hadith Referenceالمعجم الأوسط / باب الميم / 6246
Hadith Gradingمحدثین:رجاله رجال الصحيح
Hadith Takhrij«قال الهيثمي: رجاله رجال الصحيح «مجمع الزوائد ومنبع الفوائد، ج 4، ص 267»» «أخرجه الطبراني فى «الأوسط» برقم: 9102»