Sunan an-Nasa'i, Volume 5, Book 42, Hadith 4320 (DarusSalam)

It was narrated from Ibn 'Umar that a man said: "O Messenger of Allah what do you think about mastigures?" He said: "I do not eat them but I do not say that they arte Haram."

أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، وَعَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَجُلاً، قَالَ يَا رَسُولَ اللَّهِ مَا تَرَى فِي الضَّبِّ قَالَ ‏ "‏ لَسْتُ بِآكِلِهِ وَلاَ مُحَرِّمِهِ ‏" ‏ ‏.‏

sunnah.com