(42) The Book of Hunting and Slaughtering
كتاب الصيد والذبائح
(26) Chapter: Mastigures
(26) باب الضَّبِّ ‏‏
Sunan an-Nasa'i 4314 
It was narrated from Ibn 'Umar that:
the Messenger of Allah was asked about mastigures when he was on the Minbar and he said? "I do not eat them, but I do not say that they are Haram."
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا مَالِكٌ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم وَهُوَ عَلَى الْمِنْبَرِ سُئِلَ عَنِ الضَّبِّ فَقَالَ ‏ "‏ لاَ آكُلُهُ وَلاَ أُحَرِّمُهُ ‏"‏ ‏.‏
Grade :  Sahih (Darussalam)
Reference : Sunan an-Nasa'i 4314
In-book reference : Book 42, Hadith 52
English translation : Vol. 5, Book 42, Hadith 4319