In this rule

Historical Rules · 3 May 2019

Rule 116.2e

Official source text from the 3 May 2019 Rules release

Permalink

Resolving spells and abilities may instruct players to make choices or take actions, or may allow players to activate mana abilities. Even if a player is doing so, no player has priority while a spell or ability is resolving. See rule 608, “Resolving Spells and Abilities.”

Find this number in the current Rules