21 Heb “Thus God will do to the enemies of David and thus he will add.” Most of the Old Greek tradition has simply “David,” with no reference to his enemies. In OT imprecations such as the one found in v. 22 it is common for the speaker to direct malediction toward himself as an indication of the seriousness with which he regards the matter at hand. In other words, the speaker invites on himself dire consequences if he fails to fulfill the matter expressed in the oath. However, in the situation alluded to in v. 22 the threat actually does not come to fruition due to the effectiveness of Abigail’s appeal to David in behalf of her husband Nabal. Instead, David is placated through Abigail’s intervention. It therefore seems likely that the reference to “the enemies of David” in the of v. 22 is the result of a scribal attempt to deliver David from the implied consequences of this oath. The present translation follows the rather than the here.
22 Heb “one who urinates against a wall” (also in v. 34); “any that pisseth against the wall.”

In other versions

God do so to the enemies of David and more also, if by morning I leave so much as one male of all who belong to him.”

May God deal with David, be it ever so severely, if by morning I leave alive one male of all who belong to him!”

May God punish me and do so severely if I let any of his males survive until morning.”

May God strike me and kill me if even one man of his household is still alive tomorrow morning!”

May God severely punish the enemies of David and again do thus if I leave behind anything that is his until the morning, not even one male!”

So and more also do God unto the enemies of David, if I leave of all that pertain to him by the morning light any that pisseth against the wall.

Public Domain