Al-Kāfi - Volume 3 > Rules about Profits after Paying Zakat
Hadith #1

1 - محمد بن يحيى، عن أحمد بن محمد، والحسين بن محمد، عن معلى بن محمد جميعا عن الحسن بن علي الوشاء، عن أبان، عن شعيب قال: قال أبو عبد الله (عليه السلام): كل شئ جر عليك المال فزكه وكل شئ ورثته أو وهب لك فاستقبل به.

1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad and al-Husayn ibn Muhammad has narrated from Mu‘alla’ ibn Muhammad all from al-Hassan ibn Ali al-Washsha’ from Aban from Shu’ayb who has said the following: “Abu ’Abd Allah, ‘Alayhi al-Salam, has said, ‘Whatever you gain by means of assets, pay Zakat thereof and whatever you receive as inheritance or gift, pay Zakat thereof after a year passes.’”

Hadith #2

2 - علي بن محمد، عن ابن جمهور، عن أبيه، عن يونس، عن عبد الحميد بن عواض، عن أبي عبد الله (عليه السلام) قال في الرجل يكون عنده المال فيحول عليه الحول ثم يصيب مالا آخر قبل أن يحول على المال الحول، قال: إذا حال على المال الأول الحول زكاهما جميعا.

2. Ali ibn Muhammad has narrated from ibn Jumhur from his father from Yunus from ‘Abd al-Hamid ibn ‘Awwad who has said the following: “I once asked abu ‘Abd Allah, ‘Alayhi al-Salam, about a man who has a certain asset which remains in his possession for one year, then he gains other assets before the passing of one year. He (the Imam) said, ‘When one year passes with the first asset, pay Zakat for both assets.’”