# See now, I

"Please listen carefully: I" See how you translated this phrase in Genesis 12:11.

# I have undertaken to speak

"Pardon me for being so bold as to speak to you" or "Excuse me for daring to speak"

# to my Lord

"to you, my Lord" 

# only dust and ashes

"only a mortal man" or "as unimportant as dust and ashes"