Barcelona welcomed Celtic in the Champions League on Wednesday knowing that a point would secure top spot in Group H.
The home side, who entered the match having lost two of their last three games in all competitions, led 3-0 interval courtesy of goals from Gerard Pique, Pedro and Neymar.
Neymar scored his second in the early stages of the second period, before the Brazilian completed his hat-trick with 30 minutes remaining.
The home side were not finished as Cristian Tello made it 6-0 in the latter stages, but Georgios Samaras had a late consolation for Celtic.
Read how it all unfolded in Sports Mole's minute-by-minute live commentary of the action below.
BARCELONA: Pinto; Montoya, Pique, Mascherano, Adriano; Busquets, Xavi, Roberto; Pedro, Neymar, Sanchez
CELTIC: Forster; Lustig, Ambrose, Van Dijk, Ledley; Matthews, Brown, Biton, Boerrigter; Samaras, Pukki