The Cattle - 6:148
"Those who associate partners will say: "If Allah had not willed, neither we nor our fathers would have associated partners, nor would we have forbidden anything."And those before them denied in the same way until they tasted Our torment. Say: "Do you have any knowledge with you that you can show us? You follow only conjecture (doubtful and contradictory narrations) and you are only guessing."
Those who associate partners attribute their associating partners to Allah:
The Heights/7:28
"When they commit any evil deed, they say: "This is what we found our forefathers doing, so Allah has commanded us". Say: "Allah does not command anything evil. How is it that you say about Allah what you do not know?"
The Bee/16:35
Those who associate partners, if Allah had not willed, neither we nor our ancestors would have served anything besides Him, nor would we have forbidden anything besides what He has forbidden. So did those before them. Does the messenger have any duty other than to make clear?
The Ornaments of Gold/43:19
They considered the angels, the servants of the Most Merciful, as female! Did they witness their creation? Their testimony will be recorded and they will be questioned.
The Ornaments of Gold/43:20
"They even said, "If the Most Merciful had willed, we would not have served them". They have no knowledge of this. They are only guessing."
The Cattle/6:144
"Two of the camel and two of the cattle. Say: "Has He forbidden two males or two females, or what is in the wombs of the two females? And who is more unjust than he who invents lies and attributes them to Allah in order to mislead the people from the way without knowledge? Allah does not guide an unjust people."
The Cattle/6:148
"Those who associate partners will say: "If Allah had not willed, neither we nor our fathers would have associated partners, nor would we have forbidden anything."And those before them denied in the same way until they tasted Our torment. Say: "Do you have any knowledge with you that you can show us? You follow only conjecture (doubtful and contradictory narrations) and you are only guessing."