Inspectah Deck's verse on the Wu Tang Clan song Triumph gets my vote for best rap verse of all time:
I bomb atomically, Socrates' philosophies
and hypotheses can't define how I be droppin’ these
mockeries, lyrically perform armed robbery
Flee with the lottery, possibly they spotted me
Battle-scarred shogun, explosion when my pen hits
tremendous, ultra-violet shine blind forensics
I inspect view, through the future see millennium
Killa B's sold fifty gold sixty platinum
Shacklin’ the masses with drastic rap tactics
Graphic displays melt the steel like blacksmiths
Black Wu jackets queen B's ease the guns in
Rumble with patrolmen, tear gas laced the function
Heads by the score take flight incite a war
Chicks hit the floor, diehard fans demand more
Behold the bold soldier, control the globe slowly
Proceeds to blow swingin’ swords like Shinobi
Stomp grounds and pound footprints in solid rock
Wu got it locked, performin’ live on your hottest block