S. 148 : Reassessment – Notice – Constitutional validity – The delegation authorized being only for the purpose of enlarging limitation under a valid law, such delegation could not be exercised to resurrect the provision of law that stood omitted from the statute book by virtue of its substitution made by the Finance Act, 2021, w.e.f. 01.04.2021.- Interpretation of Taxing Statutes — Legislative Substitution- Interpretation of Taxing Statutes — Legislative Substitution- Cassus omisus cannot be supplied, either by the delegated legislation or by Courts – The Enabling Act only extended the limitation up to 31.03.2021 to do certain things only. Thereafter, it delegated the power to cause such further extensions to do those things beyond the date 31.12.2020, upto 30.06.2021 – delegate to do colourably, that which it cannot directly do after the Parliament enforced Sections 2 to 88 of the Finance Act 2021, w.e.f. 01.04.2021. once the principal legislation enacted the law as has been done in the present case, its delegate was denuded of its powers, in the field occupied by the principal legislature- Reassessment notices issued under section 148 of the Act are quashed . [ S. 147, 148A, 149, 151 , 151A , 153,292 Relaxation of Certain Provisions) Act, 2020 , S.3(1) of the Act 38 of 2020, Art , 226 ]