Originally recorded by The Isley Brothers (US #125 1967).
Hit version by Marvin Gaye (US #7/R&B #2 1969).
From the wiki: “Co-writer Norman Whitfield produced both recording sessions for Motown, taking his up-tempo Isley Brothers arrangement and turning it into a slowed-down psychedelic Soul opus for Marvin Gaye.”
Marvin Gaye, “That’s the Way Love Is” (1969):