2 Kings 11:4

5. But you will say it is better to believe that the Apostle Paul wrote what was not true, than to believe that the Apostle Peter did what was not right. On this principle, we must say (which far be it from us to say), that it is better to believe that the gospel history is false, than to believe that Christ was denied by Peter; and better to charge the book of Kings [second book of Samuel] with false statements, than believe that so great a prophet, and one so signally chosen by the Lord God as David was, committed adultery in lusting after and taking away the wife of another, and committed such detestable homicide in procuring the death of her husband. …

5. Again, we are not responsible for what is said of Abraham, that in his irrational craving to have children, and not believing God, who promised that his wife Sara should have a son, he defiled himself with a mistress, with the knowledge of his wife, which only made it worse; or that, in sacrilegious profanation of his marriage, he on different occasions, from avarice and greed, sold his wife Sara for the gratification of the kings Abimelech and Pharas, telling them that she was his sister, because she was very fair. …

2. For there is written over it the title thereof, “A Psalm of David himself, when there came to him Nathan the prophet, when he went in unto Bersabee.” Bersabee was a woman, wife of another. With grief indeed we speak, and with trembling; but yet God would not have to be hushed what He hath willed to be written. I will say then not what I will, but what I am obliged; I will say not as one exhorting to imitation, but as one instructing you to fear. Captivated with this woman’s beauty, the wife of another, the king and prophet David, from whose seed according to the flesh the Lord was to come, committed adultery with her. This thing in this Psalm is not read, but in the title thereof it appeareth; but in the book of Kings it is more fully read. Both Scriptures are canonical, to both without any doubt by Christians credit must be given. The sin was committed, and was written down. …

9. “Against Thee alone have I sinned, and before Thee an evil thing have I done” ( ver. 4 ). What is this? For before men was not another’s wife debauched and husband slain? Did not all men know what David had done? What is, “Against Thee alone have I sinned, and before Thee an evil thing have I done.” Because Thou alone art without sin. He is a just punisher that hath nothing in Him to be punished; He is a just reprover that hath nothing in Him to be reproved. “That thou mayest be justified in Thy sayings, and conquer when Thou art judged.” To whom he speaketh, brethren, to whom he speaketh, is difficult to understand. To God surely he speaketh, and it is evident that God the Father is not judged. What is, “And conquer when Thou art judged”? He seeth the future Judge to be judged, one just by sinners to be judged, and therein conquering, because in Him was nothing to be judged. …

5. Your second question is discussed by Tertullian in his books on Monogamy where he declares that the children of believers are called holy because they are as it were candidates for the faith and have suffered no pollution from idolatry. Consider also that the vessels of which we read in the tabernacle are called holy and everything else required for the ceremonial worship: although in strictness of speech there can be nothing holy except creatures which know of and worship God. But it is a scriptural usage sometimes to give the name of holy to those who are clean, or who have been purified, or who have made expiation. For instance, it is written of Bathsheba that she was made holy from her uncleanness, and the temple itself is called the holy place.