Funk classic by Slave. Some bassists think this line is slapped, but it's actually not. It's just aggressively plucked. Note the octaves in the B section; this is something that is often missed. The octaves are very hard to hear when the vocals are happening because of how the bass is mixed (listen carefully with headphones, and you'll hear it), but it's obvious in the bass breakdown. There are lots of ad libs in this line of which I only played a few, so, as always, listen to the original to hear all the variations.
00:00:00 - Verse
00:00:23 - Chorus
00:00:48 - Verse Slow
00:01:19 - Chorus Slow