BT Pes 112a(25) :או איכא איניש גביה נימא ליה ואילא נימא איהו לנפשיה‏ : if there is someone with him let him recite (it) to him. And if not, let him recite (it) to himself
See the entire entry for ˀellā conj. if not

BT Pes 112a(25) :אזדהר משברירי‏ : be careful of š'-blindness
See the entire entry for zhr vb. to beware