عَنْ حُذَيْفَةَ رضي الله عنه أَنَّ رَسُولَ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لَا تَقُولُوا: مَا شَاءَ اللهُ وَشَاءَ فُلَانٌ، وَلَكِنْ قُولُوا: مَا شَاءَ اللهُ ثُمَّ شَاءَ فُلَانٌ».
The Prophet (may Allah's peace and blessings be upon him) forbids Muslims from saying: "What Allah wills and what so-and-so wills" in their speech, or saying: "What Allah wills and so-and-so". This is because Allah's will and determination are absolute and none shares them with Him. but using the conjunctive "and" denotes associating someone with Allah and regarding them as equals.
However, one should say: What Allah wills, then what so-and-so wills; thus, making the slave's will subordinate to Allah's will by saying "then" instead of "and", since "then" denotes sequence with a gap in time between the two things in sequence.
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