Al-Adab Al-Mufrad #766
Sayings
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللهِ، قَالَ: حَدَّثَنَا سُفْيَانُ قَالَ: قَالَ عَمْرٌو: عَنِ ابْنِ عَبَّاسٍ: لاَ يَقُولَنَّ أَحَدُكُمْ لِشَيْءٍ لاَ يَعْلَمُهُ: اللَّهُ يَعْلَمُهُ ؛ وَاللَّهُ يَعْلَمُ غَيْرَ ذَلِكَ، فَيُعَلِّمَ اللَّهَ مَا لاَ يَعْلَمُ، فَذَاكَ عِنْدَ اللهِ عَظِيمٌ.
Ibn 'Abbas said, "None of you should say about a thing which he
does not know, 'Allah knows it' when Allah may know that it is other than
what he said and thus he (tries to) teach Allah what he does not know.
That is something terrible in Allah's sight."
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About Al-Adab Al-Mufrad
This hadith is #766 from Al-Adab Al-Mufrad, in the Book of Sayings.