Bukhari attributed lie to uplift the position of Umar

Al-Bukhari mentioned that Abu Hurayra had said: "While the Abyssinians were playing with their bayonets in front of the Prophet in the mosque, Umar entered and began to throw them with pebbles. The Prophet said to Umar: "Let them do that." 1

The Prophet was far away from play and higher than levity. He knew well, more than any one else, of the prohibited actions. He would never let the ignorant to play in the mosque in front of him. He was busy, all the time, with the divine tasks. He had no time to spend with play or in vain. He was far above to let his honoured mosque be for play and vanity. (A grievous word it is that comes out of their mouths; they speak nothing but a lie) 18:5 (Quran).

1. In his Sahih, vol. 2, p.p. 120.

To know more about Abu Hurayra and his falsehood 

please visit:  http://abu-huraira.blogspot.com/