But as for what some people do regarding activities of suicide, tying explosives to themselves and then approaching Unbelievers and detonating them amongst them, then this is a case of suicide and Allaah¹s refuge is sought. So whoever commits suicide then he will be consigned eternally to Hell-Fire, remaining there forever, as occurs in the hadeeth of the Prophet, sallallaahu alaihi wa sallam. (i.e., his, sallallaahu alaihi wa sallam, saying, " and whoever kills himself with an iron weapon, then the iron weapon will remain in his hand, and he will continuously stab himself in his belly with it in the Fire of Hell eternally, forever and ever." Reported by al-Bukhaaree, no. 5778 and Muslim, no. 109, in the Book of Eemaan.)
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Source: Riyaadh us-Saaliheen (1/164-166), Trans. Dawud Burbank