Sutta about 3 people viriya sati samadhi to get flower in tree?

Can’t find / remember what sutta –
one person gets down like a bench
another gets on top to reach flower (fruit?) in tree
3rd steadies the 2nd…

Ven. Thuzana used that sutta in a dhamma talk on weekend retreat yesterday. When I asked where it’s from, he said something like “Sila-Janta Sutta”, but I didn’t get that right as can’t find anything like that (with google).

This simile seems to come from Vissudhimagga XVI 98:

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