slam means submission
A Basic Dictionary of Islamic Words by M Zakiuddin Sharfi, Islam means, “Submission or resignation to the will of Allah, completely
Surah 9:29
Fight those who believe not in Allah nor the last day, nor hold that forbidden which hath been forbidden by Allah and his apostle nor acknowledge the religion of truth of the people of the Book (the Jews and the Christians) until they pay the Jizya with willing submission and feel themselves subdued.
Surah 9:5,
Fight and slay the pagans wherever ye find them and seize them, beleaguer them, and lie in wait for them in every stratagem ...