Al-Kāfi - Volume 5 > Detestability of Estimating and Preferability of Using Measurements
Hadith #3

3- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ مُحَمَّدِ بْنِ الْحَسَنِ بْنِ شَمُّونٍ عَنْ عَبْدِ اللهِ بْنِ عَبْدِ الرَّحْمَنِ عَنْ مِسْمَعٍ قَالَ قَالَ لِي أَبُو عَبْدِ اللهِ (عَلَيْهِ السَّلام) يَا أَبَا سَيَّارٍ إِذَا أَرَادَتِ الْخَادِمَةُ أَنْ تَعْمَلَ الطَّعَامَ فَمُرْهَا فَلْتَكِلْهُ فَإِنَّ الْبَرَكَةَ فِيمَا كِيلَ.

3. A number of our people have narrated from Sahl ibn Ziyad from Muhammad ibn al-Hassan Shammun from ‘Abd Allah ibn ‘Abd al- Rahman from Misma’ who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, once said to me, ‘O abu Sayyar, when the female servant prepares food, ask her to measure; blessings come with measurement.’”