Allah states that if the disbelievers and polytheists are called to follow what Allah has revealed to His Messenger and abandon the practices of misguidance and ignorance that they indulge in, they will say, "Rather. We shall follow what we found our fathers following,'' meaning, worshipping the idols and the false deities. Allah criticized their reasoning:
﴿ أَوَلَوۡ كَانَ ءَابَآؤُهُمۡ ﴾
((Would they do that!) even though their fathers), meaning, those whom they follow and whose practices they imitate, and:
﴿ لَا يَعۡقِلُونَ شَيۡـًٔ۬ا وَلَا يَهۡتَدُونَ ﴾
(...did not understand anything nor were they guided) meaning, they had no sound understanding or guidance. Ibn Ishaq reported that Ibn `Abbas said that this was revealed about a group of Jews whom Allah's Messenger called to Islam, but they refused, saying, "Rather, we shall follow what we found our forefathers following.'' So Allah revealed this Ayah (2:170) above."
ICTruth.info