Livingston 2 Celtic 2
Tom Rogic's dramatic stoppage-time strike from the bench earned Celtic a point at Livingston and stretched their lead over Rangers at the top of the Ladbrokes Premiership.
Hoops midfielder Callum McGregor thundered in the opener from the edge of the box in the 16th minute before Livi captain Jon Guthrie levelled eight minutes later after a Fraser Forster fumble.
Midfielder Scott Robinson, who had scored in the Lions' 2-0 win over the Hoops in October, notched less than a minute after the break. However, at the death, substitute Rogic slammed in an equaliser to take Celtic 13 points clear of Rangers, who lost 1-0 at home to Hamilton.
Rangers have a game in hand but Celtic showed just how determined they are to make it nine titles in a row this season.
All eyes were on West Lothian as Livi attempted to repeat their previous shock win over the champions, who had recorded their 34th consecutive domestic cup-tie victory on Sunday with a 1-0 William Hill Scottish Cup quarter-final win at St Johnstone.
Attacker Elyounoussi returned to the Hoops side to partner striker Odsonne Edouard at the expense of Leigh Griffiths, while Robinson replaced Jack McMillan and former Celtic defender Efe Ambrose made his home debut.
The visitors took the lead moments after Hoops keeper Forster had tipped a long-distance effort from Robinson past a post.
The Parkhead side survived the corner and when they raced up the other end, the ball landed at the feet of McGregor, who drove high past Livi goalkeeper Robby McCrorie.