28 So they shouted louder and slashed themselves with swords and spears, as was their custom, until their blood flowed.

Read 1 Kings 18:28 Using Other Translations

And they cried aloud, and cut themselves after their manner with knives and lancets, till the blood gushed out upon them.
And they cried aloud and cut themselves after their custom with swords and lances, until the blood gushed out upon them.
So they shouted louder, and following their normal custom, they cut themselves with knives and swords until the blood gushed out.