1 Samuel 21:1-5 (NKJV)
1 Now David came to Nob, to Ahimelech the priest. And Ahimelech was afraid when he met David, and said to him, “Why are you alone, and no one is with you?” 2 So David said to Ahimelech the priest, “The king has ordered me on some business, and said to me, ‘Do not let anyone know anything about the business on which I send you, or what I have commanded you.’ And I have directed my young men to such and such a place. 3 Now therefore, what have you on hand? Give me five loaves of bread in my hand, or whatever can be found.” 4 And the priest answered David and said, “ There is no common bread on hand; but there is holy bread, if the young men have at least kept themselves from women.” 5 Then David answered the priest, and said to him, “Truly, women have been kept from us about three days since I came out. And the vessels of the young men are holy, and the bread is in effect common, even though it was consecrated in the vessel this day.”
It seems unusual that a prominent man like David would wonder alone around the villages of judea,so Ahimelech was afraid because he could feel that there was something wrong
It seems David lied to the priest Ahimelech because from {1 Samuel 20} David was on the run alone from Saul,since he left in a hurry he could not have taken any servants, he came to Nob in {1 Samuel 21} & mostly likely lied to Ahimelech about his companions because he feared that he might alarm the priest if he discovered that he was alone, so he pretended that he was on the king's business, but the king could not have sent him without an escort.He left Ahimelech after getting the Showbread &:went to king Achish of Gath alone where he feigned madness,it was only in { 1 Samuel 22} that he managed to gather around himself some men at the cave adullum
Now this brings in Mark
Mark 2:25-26 (NKJV)
25 But He said to them, “Have you never read what David did when he was in need and hungry, he and those with him: 26 how he went into the house of God in the days of Abiathar the high priest, and ate the showbread, which is not lawful to eat except for the priests, and also gave some to those who were with him?”
I don't know how to reconcile the above text of Mark 2, since he attributes it to Christ. maybe somebody could have another source of information to augment.