The Waqf (Amendment) Act, 2025 introduced several new features at once: a formal deed requirement for creating a waqf, a changed composition for State Waqf Boards, government verification of waqf properties, and the five-year Islamic-practice condition for anyone creating a waqf. To answer which one was stayed, it is useful to go through these features and see which one the question is actually describing.
The deed requirement and the property-verification mechanism are procedural changes to how waqfs are documented and recorded going forward, and while they raise their own concerns about older undocumented waqfs, they are not the five-year practice of Islam feature the question asks about.
The Board composition change deals with who sits on the State Waqf Board, a separate issue about denominational control over the administering body, again not the five-year practice condition.
The one feature that specifically ties eligibility to create a waqf to how long the person has practised Islam is the amended definition of waqif in the Act, which requires five years of continuous practice before a person's dedication of property as waqf will be recognised. This is the exact provision the question is describing, and it is this definitional requirement, located in Section 3(1)(b) (the proviso to the definition of waqif), that the Supreme Court stayed.
Therefore, the clause stayed by the Supreme Court is the five-year continuous-practice-of-Islam requirement in Section 3(1)(b), the proviso to the definition of waqif in the Waqf Amendment Act, 2025.