(2) باب الإِحْصَارِ فِي الْحَجِّ
Narrated Salim:
(Abdullah) bin `Umar used to say, "Is not (the following of) the tradition of Allah's Messenger (ﷺ) sufficient for you? If anyone of you is prevented from performing Hajj, he should perform the Tawaf of the Ka`ba and between As-Safa and Al-Marwa and then finish the Ihram and everything will become legal for him which was illegal for him (during the state of Ihram) and he can perform Hajj in a following year and he should slaughter a Hadi or fast in case he cannot afford the Hadi."
Reference: Sahih al-Bukhari 1810
In-book reference: Book 27, Hadith 5
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 28, Hadith 37