Sahih Al Bukhari 1: Chapter 3, Hadith 84

(84) Whoever gave a religious verdict by beckoning or by nodding

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَدَّثَنَا وُهَيْبٌ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَدَّثَنَا أَيُّوبُ، ‏‏‏‏‏‏عَنْ عِكْرِمَةَ، ‏‏‏‏‏‏عَنِ ابْنِ عَبَّاسٍ، ‏‏‏‏‏‏"أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ سُئِلَ فِي حَجَّتِهِ، ‏‏‏‏‏‏فَقَالَ:‏‏‏‏ ذَبَحْتُ قَبْلَ أَنْ أَرْمِيَ؟ فَأَوْمَأَ بِيَدِهِ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ وَلَا حَرَجَ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَلَقْتُ قَبْلَ أَنْ أَذْبَحَ؟ فَأَوْمَأَ بِيَدِهِ، ‏‏‏‏‏‏وَلَا حَرَجَ".

SAHIH HADITH:

Narrated Ibn `Abbas: Somebody said to the Prophet (during his last Hajj), I did the slaughtering before doing the Rami.' The Prophet beckoned with his hand and said, There is no harm in that. Then another person said. I got my head shaved before offering the sacrifice. The Prophet beckoned with his hand saying, There is no harm in that.

REFERENCE:

Sahih Al Bukhari 1: Chapter 3, Hadith 84