It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever sits on the bed of a woman whose husband is away, a great serpent will be set upon him on the Day of Resurrection."
Hadith Referenceالمعجم الأوسط / باب الباء / 3213
Hadith Takhrij«أخرجه أحمد فى «مسنده» برقم: 22995، 23001، والطبراني فى «الكبير» برقم: 3278»