When Abu Bakr and Muhammad escaped from Mecca in 622 , Amir grazed Abu Bakr 's flocks by day , then brought them at evening to the cave where Abu Bakr and Muhammad were hiding , presumably .
The sheep would cover flocks ' tracks .
When Abu Bakr and Muhammad escaped from Mecca in 622 , Amir grazed Abu Bakr 's flocks by day , then brought them at evening to the cave where Abu Bakr and Muhammad were hiding , presumably so that the sheep would cover their tracks .