What are you doing? They said: We are grafting them, whereupon he said: It may perhaps be good for you if you do not do that, so they abandoned this practice (and the date-palms) began to yield less fruit. They made a mention of it (to the Holy Prophet), whereupon he said: I am a human being, so when I command you about a thing pertaining to religion, do accept it, and when I command you about a thing out of my personal opinion, keep it in mind that I am a human being. 'Ikrima reported that he said something like this. (Using translation from Muslim 2362)
قَدِمَ رَسُولُ اللهِ ﷺ الْمَدِينَةَ وَهُمْ يُؤَبِّرُونَ النَّخْلَ يَقُولُ يُلَقِّحُونَ قَالَ «مَا تَصْنَعُونَ؟» قَالُوا كُنَّا نَصْنَعُهُ قَالَ «لَوْ لَمْ تَفْعَلُوا كَانَ خَيْرًا» فَتَرَكُوهَا فَشِيصَتْ فَذُكِرَ ذَلِكَ لَهُ فَقَالَ «إِنَّمَا أَنَا بَشَرٌ فَإِذَا أَمَرْتُكُمْ بِشَيْءٍ مِنْ دِينِكُمْ فَخُذُوا بِهِ وَإِذَا أَمَرْتُكُمْ بِشَيْءٍ مِنْ دُنْيَاكُمْ فَإِنَّمَا أَنَا بَشَرٌ»