Whatsoever thou desirest He does not say, that shall be lawful and honest; for he knew David too well to think he would ask anything that was otherwise. I will do it for thee This is true friendship. Thus Christ testifies his love to us; Whatsoever ye shall ask in my name, that will I do. And we must testify ours to him by keeping his commandments. Behold, to-morrow is the new-moon There were solemn sacrifices every new-moon, and then a feast upon them. And David being one of the king's family, by marrying his daughter, used to eat with them at these festival times. That I may hide myself in the field till the third day That is, unto the next day but one after the new-moon. His meaning is not, that he would hide himself in any certain place all the three days, but that he would secure himself, either at Beth-lehem with his friends, or in some other place till the third day.
Related Commentaries of 1 Samuel 20:4
1 Samuel 20:4-5
4 Then said Jonathan unto David, Whatsoever thy soul desireth, I will even do it for thee.
5 And David said unto Jonathan, Behold, to morrow is the new moon, and I should not fail to sit with the king at meat: but let me go, that I may hide myself in the field unto the third day at even.