حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا أَبُو حَفْصٍ، عُمَرُ بْنُ الدَّرَفْسِ حَدَّثَنِي عَبْدُ الرَّحْمَنِ بْنُ أَبِي قَسِيمَةَ، عَنْ وَاثِلَةَ بْنِ الأَسْقَعِ اللَّيْثِيِّ، قَالَ أَخَذَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ بِرَأْسِ الثَّرِيدِ فَقَالَ ‏"‏ كُلُوا بِسْمِ اللَّهِ مِنْ حَوَالَيْهَا وَاعْفُوا رَأْسَهَا فَإِنَّ الْبَرَكَةَ تَأْتِيهَا مِنْ فَوْقِهَا ‏"‏ ‏.‏

It wasnarrated that Wathilah bin Asqa’ Al-Laithi said: “TheMessengerof Allah (PBUH) took hold of the top of the Tharid and said:‘Eat inthe Name of Allah from its sides and leave the top, for theblessingcomes from its top.’” Translation Not Available

Book Ref: Sunan Ibn Majah Book 29 Hadith 3276
Web Ref:  Sunan Ibn Majah Vol 4 Book 29 Hadith 3276