Al-Daraqutni (may Allah have mercy on him) said: No one other than Ishaq narrated it as the words of the Prophet (marfu'), and it is said that he retracted it; the correct view is that it is mawquf (the words of Ibn Umar).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحدود / 16938