«فَمَنْ رَغِبَ عَنْ سُنَّتِي فَلَيْسَ مِنِّي» (رواه البخاري ومسلم)
Translation: “Whoever turns away from my way is not of me.” (Bukhari and Muslim)
Raghiba ʿan means turning away from or rejecting something, not merely being unable to perform one practice. The strong expression fa-laysa minnī warns against rejecting the Prophet's pattern in favor of a supposedly superior self-invented religious program.
It does not mean that a person who cannot marry or observe certain voluntary practices for legitimate reasons is automatically included in the warning. Its focus is rejection of the Prophetic way.