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There is a Legacy version here.

PFS StandardCast Down [one-action] Feat 6

Cleric Concentrate Spellshape 
Source Player Core pg. 116 2.0

The sheer force of your faith can bring a foe crashing down. If the next action you use is to cast harm or heal to damage one creature, the target is knocked prone if it takes any damage from the spell. If the target critically fails its save against the spell, it also takes a –10-foot status penalty to its Speed for 1 minute.

Traits

Concentrate:

An action with this trait requires a degree of mental concentration and discipline.

Spellshape:

Actions with the spellshape trait tweak the properties of your spells. You must use a spellshape action directly before casting the spell you want to alter. If you use any action (including free actions and reactions) other than casting a spell directly after, you waste the benefits of the spellshape action. Any additional effects added by a spellshape action are part of the spell's effect, not of the spellshape action itself.