וַיָּ֤טֶל שָׁאוּל֙ אֶֽת־הַחֲנִ֔ית וַיֹּ֕אמֶר אַכֶּ֥ה בְדָוִ֖ד וּבַקִּ֑יר וַיִּסֹּ֥ב דָּוִ֛ד מִפָּנָ֖יו פַּעֲמָֽיִם׃
Rashi on I Samuel
I will strike Dovid and the wall. I will strike one blow so, that the spear will pierce Dovid and the wall.2Shaul wanted to strike Dovid in a manner that it would appear that it was unintentional.