"The Leap" is the 24th and final episode of season 4 of the How I Met Your Mother TV series and 88th overall.
When he shows up to his restaurant design meeting, his clients decide to go with Swedish avant-garde architecture collective Sven, instead of him.
Lily then tells him that Robin overheard him using a suit analogy to ask for Ted's blessing to pursue her, and was worried about what to do.
She discussed it with Lily and Marshall (who reveal they had known for months), who advised her to "Mosby" Barney, telling him she loves him right away, just like Ted did.
Cheered on by his friends, Ted makes the leap to the other building alongside them and later accepts the professor job at the University.