AHMAD-ZUHD 1711:
from Āʿlamūā —
[Machine] "That worship is the performance of obligations and the avoidance of prohibitions"
الزهد لأحمد ١٧١١:
عن اعلموا —
أَنَّ الْعِبَادَةَ أَدَاءُ الْفَرَائِضِ وَاجْتِنَابُ الْمَحَارِمِ»