Ibrahim (may Allah have mercy on him) said: "When a person makes a bequest of a third, a fourth, or a fifth of his wealth, it will be counted from both the present and deferred wealth. And if a specific item is bequeathed for someone, then as long as the third is not completed, it will be taken only from the present wealth; thereafter, it will be counted from both the present and deferred wealth."
Hadith Referenceسنن سعید بن منصور / كتاب ولاية العصبة / 1528
Hadith Takhrij«أخرجه الدارمي فى «مسنده» برقم: 3267، وسعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 351، 352، 353، وابن أبى شيبة فى «مصنفه» برقم: 31394»