Mukhtasar Bukhari

Narrated from Sayyiduna Anas (may Allah be pleased with him) that Abu Bakr Siddiq (may Allah be pleased with him) wrote for them what Allah had commanded His Messenger: that whoever is liable for a one-year-old she-camel in charity and does not have it, but has a two-year-old she-camel, then it will be accepted from him, and the collector of charity will return twenty dirhams or two goats to him. And if he does not have a one-year-old she-camel (nor a two-year-old one, rather) but has a three-year-old camel, then it will be accepted from him and nothing will be given to him along with it.