'Quick' in the Bible

The three sons of Zeruiah were there -- Joab, Abishai, and Asahel. (Now Asahel was as quick on his feet as one of the gazelles in the field.)

And David said to all his servants that were with him at Jerusalem, Rise up and let us flee; for we shall not else escape from Absalom. Be quick to depart, lest he overtake us quickly, and bring evil upon us, and smite the city with the edge of the sword.

Now Ahithophel's advice that he provided at that time was being compared to one who inquired of God, so highly regarded was Ahithophel's counsel by both David and Absalom.