Ubaida ibn As-Samit reported: A man came to the Prophet, peace and blessings be upon him, and he said, “O Prophet of Allah, which deed is best?” The Prophet said, “Faith and belief in Allah and striving in his cause.” The man said, “O Messenger of Allah, I want something easier than that.” The Prophet said, “Behave with tolerance and patience.” The man said, “O Messenger of Allah, I want something easier than that.” The Prophet said, “Do not protest Allah the Exalted in what He has decreed for you.”

Source: Musnad Ahmad 22210

Grade: Sahih (authentic) according to Ibn Kathir

عن عبادة بن الصامت قال إِنَّ رَجُلًا أَتَى النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ يَا نَبِيَّ اللَّهِ أَيُّ الْعَمَلِ أَفْضَلُ قَالَ الْإِيمَانُ بِاللَّهِ وَتَصْدِيقٌ بِهِ وَجِهَادٌ فِي سَبِيلِهِ قَالَ أُرِيدُ أَهْوَنَ مِنْ ذَلِكَ يَا رَسُولَ اللَّهِ قَالَ السَّمَاحَةُ وَالصَّبْرُ قَالَ أُرِيدُ أَهْوَنَ مِنْ ذَلِكَ يَا رَسُولَ اللَّهِ قَالَ لَا تَتَّهِمِ اللَّهَ تَبَارَكَ وَتَعَالَى فِي شَيْءٍ قَضَى لَكَ بِهِ

22210 مسند أحمد بَاقِي مُسْنَدِ الْأَنْصَارِ أي العمل أفضل قال الإيمان بالله وتصديق به وجهاد في سبيله