Anas ibn Malik reported: The Messenger of Allah, peace and blessings be upon him, said, “The servant will continue to be upon goodness as long as he is not impatient.” They said, “O Messenger of Allah, how is he impatient?” The Prophet said, “He says: I have supplicated to my Lord and he did not answer me.”
Source: Musnad Aḥmad 12596
Grade: Sahih li ghayrihi (authentic due to external evidence) according to Al-Arna’ut
عَنْ أَنَسٍ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا يَزَالُ الْعَبْدُ بِخَيْرٍ مَا لَمْ يَسْتَعْجِلْ قَالُوا يَا رَسُولَ اللَّهِ كَيْفَ يَسْتَعْجِلُ قَالَ يَقُولُ دَعَوْتُ رَبِّي فَلَمْ يَسْتَجِبْ لِي
12596 مسند أحمد باقي مسند المكثرين
13198 المحدث شعيب الأرناؤوط خلاصة حكم المحدث صحيح لغيره في تخريج المسند