matareis
-you will kill
The word matareis is the future subjunctive form of matar in the second person plural.
See the full matar conjugation

matar

Y Sansón les dijo: Juradme que no me mataréis.
And Samson said to them, Swear to me that you will not fall upon me yourselves.
Ellos entonces le dijeron: Nosotros hemos venido para prenderte, y entregarte en mano de los Filisteos. Y Samsón les respondió: Juradme que vosotros no me mataréis.
They said to him, We have come down to bind you, that we may deliver you into the hand of the Philistines. Samson said to them, Swear to me that you will not fall on me yourselves.
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