عَن ابنِ عمَرَ قَالَ: كُنَّا نَأْكُلُ عَلَى عَهْدِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَنَحْنُ نَمْشِي وَنَشْرَبُ وَنَحْنُ قِيَامٌ. رَوَاهُ التِّرْمِذِيُّ وَابْنُ مَاجَهْ وَالدَّارِمِيُّ وَقَالَ التِّرْمِذِيُّ: هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ

Abu Sa'id al-Khudri told that the Prophet forbade blowing into a drink. When a man said he saw specks in the vessel he told him to pour them out, and when he said his thirst was not quenched in one breath he told him to remove the cup from his mouth and take a breath.Tirmidhi and Darimi transmitted it.