Shemos 4:10 (Artscroll English Tanach)
"Moses replied to HASHEM, "Please, my Lord, I am not a man of words, not since yesterday, nor since the day before yesterday, nor since You first spoke to Your servant..."
Here Moshe was talking with G-d when He appeared to him in the Burning Bush. It was the first time God speak to Moshe according to the Torah.
Then what did Moshe Rabbeinu mean when he said "..nor since You first spoke to Your servant" ?