Hadith on Monotheism: People have lied against Allah by denying the Hereafter and associating partners with Him

Ibn Abbas reported: The Prophet, peace be upon him, said, “Allah the Exalted said: The son of Adam has lied against Me but he has no right to do so, and he has abused Me but he has no right to do so. As for his lie, it is his saying that I cannot recreate him as I did before; and as for his abuse, it is his saying that I have a son, but glorified am I above taking a wife or a son.”

[Sahih Bukhari, Book 60, Number 9]

عَنْ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا  عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ قَالَ اللَّهُ كَذَّبَنِي ابْنُ آدَمَ وَلَمْ يَكُنْ لَهُ ذَلِكَ وَشَتَمَنِي وَلَمْ يَكُنْ لَهُ ذَلِكَ فَأَمَّا تَكْذِيبُهُ إِيَّايَ فَزَعَمَ أَنِّي لَا أَقْدِرُ أَنْ أُعِيدَهُ كَمَا كَانَ وَأَمَّا شَتْمُهُ إِيَّايَ فَقَوْلُهُ لِي وَلَدٌ فَسُبْحَانِي أَنْ أَتَّخِذَ صَاحِبَةً أَوْ وَلَدًا

صحيح البخاري كِتَاب تَفْسِيرِ الْقُرْآنِ سُورَةُ الْبَقَرَةِ بَاب وَقَالُوا اتَّخَذَ اللَّهُ وَلَدًا سُبْحَانَهُ