Celtic moved three points clear of Rangers at the top of the SPL with a 2-1 win over Hibernian at Parkhead, while Motherwell won 2-0 at Hearts.
Former Celtic striker Derek Riordan pulled a goal back soon after to set up a nervy end to the game but Celtic held onto their lead to leapfrog their Old Firm rivals, who play at Aberdeen on Sunday
Motherwell continued their perfect domestic away record to move third in the table after new father Chris Humphrey set up both goals in an impressive 2-0 victory at Hearts.
The winger, whose partner gave birth to a girl on Thursday, brilliantly created second-half goals for Nick Blackman and John Sutton.
Hearts never troubled Motherwell goalkeeper Darren Randolph and the visitors comfortably secured their fifth away clean sheet and win of the season.
Dundee United chalked up their second SPL win of the season with a 1-0 victory over St Johnstone in a fiery Tayside derby.
David Goodwillie scored the only goal of the game when he reacted quickest to turn a loose ball home after a Paul Dixon corner in the 61st minute.
The result was harsh on the visitors who over the course of the match created the better opportunities but could find no way past Dusan Pernis.
Conor Sammon grabbed a late leveller as Kilmarnock staged a dramatic comeback to earn a point from a 2-2 draw against Hamilton.
Accies appeared to be cruising thanks to first-half goals from Flavio Paixao and Nigel Hasselbaink, who netted his first goal for the club.
But Jamie Hamill pulled a goal back in controversial circumstances from the penalty spot, before Sammon produced the equaliser late on.
Eric Odhiambo scored in each half to give Inverness a 2-1 victory at St Mirren.
The striker opened the scoring in first-half stoppage-time, sliding low into the net from close range following a Stuart Duff free-kick, and doubled his tally five minutes after the break by lashing home from a Jonny Hayes cross.
Paul McGowan scored an impressive consolation goal for the hosts, but they were unable to equalise as the Highlanders extended their season record of collecting all their SPL points on the road.
