The group gets ready to once again catch a plane to Nanda Parbat in episode 3x22 "This Is Your Sword".
Oliver talks to Lance about a body killed with an arrow in episode 3x07 "Draw Back Your Bow".
The Arrow waits for Ruvé Adams outside her office to propose a meeting with Darhk in episode 4x12 "Unchained".
Merlyn meets with Darhk's 'Ace in the Hole' in episode 4x17 "Beacon of Hope".
Oliver waits for Lance who is searching the old League of Assassin's warehouse and tries to talk him out of his search in episode 4x19 "Canary Cry".
From episode 3x04 "The Magician".