"The Messenger of Allah said: 'If any one of you sells a sheep or a milch- camel, let him not refrain from milking it.'' (Sahih )  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا بَاعَ أَحَدُكُمُ الشَّاةَ أَوِ اللَّقْحَةَ فَلاَ يُحَفِّلْهَا