בי

Etymology 1
According to (in his short commentary to Genesis 43:20 ), the particle comes from the preposition, and is short for something like "the sin is mine", meaning "I sin in speaking, so do to me what you will, but hear me out". According to (in his commentary ad loc.), the particle does not exist as a separate sense; rather, all instances of  are to be translated "master over me", and similarly wherever else  appears, which is thus just the preposition form.

Particle

 * 1)  please: