Abdullah bin Mas'ud (may Allah be pleased with him) narrated: I asked the Prophet (peace and blessings be upon him) about the major sins, and he (peace and blessings be upon him) said: "To associate partners with Allah." I asked: Then which? He (peace and blessings be upon him) said: "To kill your child for fear of provision." I asked: Then which? He (peace and blessings be upon him) said: "To commit fornication with your neighbour's wife."
The hadith of Mansur and al-A'mash is connected (mawsul), while the hadith of Wasil from Abu Wa'il from Abdullah does not mention Amr bin Shurahbil.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15840