The match which saw substitute Reiss Nelson score a double on Sunday, pushed the Gunners ahead of champion’s Manchester City with 31 points.
This will be the first time the Gunners have won by five goals since 2018.
Gabriel Martinelli gave the early opener in the first five minutes and the game went into half time with Arsenal only one goal ahead.
But with Saka out and Reiss Nelson replacing the winger in the second half, Nelson quickly tripled the scoreline in the 49th and 52nd minutes, followed by Thomas Partey’s 57th minute goal and Martin Odegaard’s finisher in the 78th minute.
Striker Gabriel Jesus gave Nelson the assists that led to his goals, while Nelson also gave the last assist of the match to captain Odegaard.
The Gunners are now two points ahead of City, who are second place with 29 points.
Nottingham Forrest with the defeat remain in the relegation zone and are sitting in 20th place with nine points.
Although Forrest had a splendid win last week after defeating Liverpool 1-0, they were unable to replicate the shocker against the Gunners.
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