وَعَنْ حُذَيْفَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: لَا تَقُولُوا: مَا شَاءَ اللَّهُ وَشَاءَ فُلَانٌ وَلَكِنْ قُولُوا: مَا شَاءَ اللَّهُ ثُمَّ شَاءَ فلَان . رَوَاهُ أَحْمد وَأَبُو دَاوُد
Hudhayfah (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him), he (peace and blessings be upon him) said: "Do not say: 'Whatever Allah wills and so-and-so wills,' but rather say: 'Whatever Allah wills, then so-and-so wills.'" Its chain is authentic; narrated by Ahmad and Abu Dawood.