A refining surface (1, 2) of a refiner for defibrating lignocellulose-containing material has a first blade bar (14′) and a second blade bar (14″) with a blade groove (15) therebetween. A third blade bar has a rising guide surface (21) for guiding the lignocellulose-containing material to an upper surface (14c) of the third blade bar. The third bar guide surface is arranged, in the direction of travel of the first and the second blade bar (14″), at least partly between the first and the second blade bar, between the first blade bar and an imaginary extension of the second blade bar, between an imaginary extension of the first blade bar and the second blade bar, or between the imaginary extensions of both the first and the second blade bar.