Ibn Tawus (may Allah have mercy on him) narrates from his father that when the grain was brought out for him from his land, he would pay its zakah; then he would keep it for a year or two without paying a tenth or the like on it, although he intended to sell it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7496