"Expand my steps under me and let my feet not slip. They shall not widen, nor shall they push, nor shall they falter. Rabbi Yehoshua ben Levi said that from the power of the sword that lifted him, Yoav pushed David back eighteen cubits, and he fell to the ground. Both of them were afraid of each other.
And David cried out to the Lord, "Expand my steps under me." Immediately, the Lord caused Avishai ben Tzeruyah to grow, as it is said, "And Avishai son of Tzeruyah came to help him" (2 Samuel 21:17). Yoav said to his men, "Let us surround him, ten against one." They replied, "We will not kill you.
A burden on the mother's womb kills ten people." Rabbi Shmuel bar Nachmani said that when David saw the angel, his blood turned to water from fear, as it is said, "And they covered him with clothes, but he could not get warm" (1 Kings 1:1). This teaches that he was afraid and his blood turned to water."