The line "crossed over seven seas" appears in "Exodus" by Bob Marley & The Wailers (1977, album Exodus). The full couplet:
"Open your eyes and look within / Are you satisfied with the life you're living? / We know where we're going / We know where we're from / We're leaving Babylon / We're going to our Father's land / Crossed over seven seas / Exodus, movement of Jah people"
The song draws on the biblical Exodus narrative as a metaphor for Rastafarian repatriation to Africa and liberation from oppression ("Babylon"). The "seven seas" evokes a global, epic journey.