Sayyidina Sad Maalik (RA) said: During my illness, Allah’s Messenger (SAW) visited me asked me, “Have you willed.” I said, “Yes.” He asked, “How much property?” I said, “All my property, in Allah’s cause.” He said, “What have you kept aside for your children?” I said, “They are rich and happy.” He said, “Make a will for one-tenth (leaving one-ninth for your children).’ I did not cease to diminish it till be said, “Make a will for one-third though that is much.” Abu Abdur Rahman said, “We wished that he should lower down on one-third because of the saying of Allah’s Messenger that one-third is too much.”
[Muslim 1628]