12 So Michal let David down through the window, and he fled away and escaped. 13 Michal took an image and laid it on the bed and put a pillow of goats' hair at its head and covered it with the clothes. 14 And when Saul sent messengers to take David, she said, "He is sick." 15 Then Saul sent the messengers to see David, saying, "Bring him up to me in the bed, that I may kill him." 16 And when the messengers came in, behold, the image was in the bed, with the pillow of goats' hair at its head. 17 Saul said to Michal, "Why have you deceived me thus and let my enemy go, so that he has escaped?" And Michal answered Saul, "He said to me, 'Let me go. Why should I kill you?'"
18 Now David fled and escaped, and he came to Samuel at Ramah and told him all that Saul had done to him. And he and Samuel went and lived at Naioth.
Matthew Henry's Commentary on 1 Samuel 19:12-18
Commentary on 1 Samuel 19:11-24
(Read 1 Samuel 19:11-24)
Michal's stratagem to gain time till David got to a distance was allowable, but her falsehood had not even the plea of necessity to excuse it, and manifests that she was not influenced by the same spirit of piety which had dictated Jonathan's language to Saul. In flying to Samuel, David made God his refuge. Samuel, as a prophet, was best able to advise him what to do in this day of distress. He met with little rest or satisfaction in Saul's court, therefore went to seek it in Samuel's church. What little pleasure is to be had in this world, those have who live a life of communion with God; to that David returned in the time of trouble. So impatient was Saul after David's blood, so restless against him, that although baffled by one providence after another, he could not see that David was under the special protection of God. And when God will take this way to protect David, even Saul prophesies. Many have great gifts, yet no grace; they may prophesy in Christ's name, yet are disowned by him. Let us daily seek for renewing grace, which shall be in us as a well of water springing up into everlasting life. Let us cleave to truth and holiness with full purpose of heart. In every danger and trouble, let us seek protection, comfort, and direction in God's ordinances.