Sayyiduna Abdullah (may Allah be pleased with him) said: None of you should say: I am bound (sarurah), for a Muslim is not bound. And none of you should say: I am a hajji, for the hajji is only the one in ihram.
This is mursal, and it is mawquf on Abdullah bin Mas'ud.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9771