I have not come across any attestations of the word sabi 'know' in contemporary Jamaican Creole, however, Cassidy & Le Page (1967: 389) record a compound sabi-so [from a work published in 1927] meaning 'understanding, wisdom', which they derive from English savvy + so. Going against their etymology, I take the first element to be the reflex of the general pidgin lexeme sabi.
Source: Cassidy et al. 1967: 389