Ps 58:7

“"Behold, themselves shall speak in their mouth, and a sword is on the lips of them" (ver. 7). Here is that sword twice whetted, whereof the Apostle saith, "And the sword of the Spirit, which is the Word of God." Wherefore twice whetted? Wherefore, but because smiting out of both Testaments? With this sword were slain those whereof it was said to Peter, "Slay, and eat." "And a sword is on the lips of them. For who hath heard?" They all speak in their mouth, "Who hath heard?" That is, they shall be wroth with men that are slow to believe. They that a little before were even themselves unwilling to believe, do feel disgust from men not believing. And truly, brethren, so it is. Thou seest a man slow before he is made a Christian; thou criest to him daily, hardly he is converted: suppose him to be converted, and then he would have all men to be Christians, and wondereth that not yet they are. It hath chanced out to him at evening to have been converted: but because he hath been made hungering like a dog, he hath also on his lips a sword; he saith, "Who hath heard?" What is, "Who hath heard?" "Who hath believed our hearing, and to whom hath the arm of the Lord been revealed?" "For who hath heard?" The Jews believe not: they have turned them to the nations, and have preached. The Jews did not believe; and nevertheless through believing Jews the Gospel went around the city, and they said, "For who hath heard?"”

“They return in the evening, etc... Behold, they spew forth with their mouth The interpretation of these two verses connects one to the other. They return in the evening What they did by day does not suffice them; in the evening they repeat their evil: guarding me that I do not escape and leave the city Now what did they do by day? Behold, all day they spew forth with their mouth, to spy on me to Saul.”