I and Messenger of Allah ﷺ happened to pass by people near the date-palm trees. He (the Holy Prophet) said: What are these people doing? They said: They are grafting, i. e. they combine the male with the female (tree) and thus they yield more fruit. Thereupon Messenger of Allah ﷺ said: I do not find it to be of any use. The people were informed about it and they abandoned this practice. Messenger of Allah ﷺ (was later) on informed (that the yield had dwindled), whereupon he said: If there is any use of it, then they should do it, for it was just a personal opinion of mine, and do not go after my personal opinion; but when I say to you anything on behalf of Allah, then do accept it, for I do not attribute lie to Allah, the Exalted and Glorious.  

مَرَرْتُ مَعَ رَسُولِ اللَّهِ ﷺ بِقَوْمٍ عَلَى رُءُوسِ النَّخْلِ فَقَالَ مَا يَصْنَعُ هَؤُلاَءِ فَقَالُوا يُلَقِّحُونَهُ يَجْعَلُونَ الذَّكَرَ فِي الأُنْثَى فَيَلْقَحُ فَقَالَ رَسُولُ اللَّهِ ﷺ مَا أَظُنُّ يُغْنِي ذَلِكَ شَيْئًا قَالَ فَأُخْبِرُوا بِذَلِكَ فَتَرَكُوهُ فَأُخْبِرَ رَسُولُ اللَّهِ ﷺ بِذَلِكَ فَقَالَ إِنْ كَانَ يَنْفَعُهُمْ ذَلِكَ فَلْيَصْنَعُوهُ فَإِنِّي إِنَّمَا ظَنَنْتُ ظَنًّا فَلاَ تُؤَاخِذُونِي بِالظَّنِّ وَلَكِنْ إِذَا حَدَّثْتُكُمْ عَنِ اللَّهِ شَيْئًا فَخُذُوا بِهِ فَإِنِّي لَنْ أَكْذِبَ عَلَى اللَّهِ ﷻ  

“I passed by some palm trees with the Messenger of Allah ﷺ and he saw some people pollinating the trees. He said: 'What are these people doing?' They said: 'They are taking something from the male part (of the plant) and putting it in the female part.' He said: 'I do not think that this will do any good.' News of that reached them, so they stopped doing it, and their yield declined. News of that reached the Prophet ﷺ and he said: 'That was only my thought. If it will do any good, then do it. I am only a human being like you, and what I think may be right or wrong. But When I tell you: “Allah (SWT) says,” I will never tell lies about Allah (SWT).' ”  

مَرَرْتُ مَعَ رَسُولِ اللَّهِ ﷺ فِي نَخْلٍ فَرَأَى قَوْمًا يُلَقِّحُونَ النَّخْلَ فَقَالَ مَا يَصْنَعُ هَؤُلاَءِ قَالُوا يَأْخُذُونَ مِنَ الذَّكَرِ فَيَجْعَلُونَهُ فِي الأُنْثَى قَالَ مَا أَظُنُّ ذَاكَ يُغْنِي شَيْئًا فَبَلَغَهُمْ فَتَرَكُوهُ وَنَزَلُوا عَنْهَا فَبَلَغَ النَّبِيَّ ﷺ فَقَالَ إِنَّمَا هُوَ ظَنٌّ إِنْ كَانَ يُغْنِي شَيْئًا فَاصْنَعُوهُ فَإِنَّمَا أَنَا بَشَرٌ مِثْلُكُمْ وَإِنَّ الظَّنَّ يُخْطِئُ وَيُصِيبُ وَلَكِنْ مَا قُلْتُ لَكُمْ قَالَ اللَّهُ فَلَنْ أَكْذِبَ عَلَى اللَّهِ  

The Messenger of Allah ﷺ passed by some people who were at the top of the palm trees. He said: ʿWhat are these people doing?ʿ They said: “They are pollinating (the trees), putting the male with the female.” He said: ʿI do not think this can help in any way.” They were told about that and they stopped doing it. News of that reached the Messenger of Allah ﷺ and he said: “If it will benefit them, then let them do it. It was only a passing thought. Do not blame me for a mere thought, but if I tell you anything about Allah (may He be glorified and exalted) then accept it from me, for I will never tell a lie about Allah.ʿ  

مَرَّ رَسُولُ اللهِ ﷺ عَلَى قَوْمٍ فِي رُءُوسِ النَّخْلِفَقَالَ مَا يَصْنَعُ هَؤُلاءِ؟ قَالُوا يُلَقِّحُونَهُ يَجْعَلُونَ الذَّكَرَ فِي الْأُنْثَى قَالَ مَا أَظُنُّ ذَلِكَ يُغْنِي شَيْئًا فَأُخْبِرُوا بِذَلِكَ فَتَرَكُوهُ فَأُخْبِرَ رَسُولُ اللهِ ﷺ فَقَالَ إِنْ كَانَ يَنْفَعُهُمْ فَلْيَصْنَعُوهُ فَإِنِّي إِنَّمَا ظَنَنْتُ ظَنًّا فَلا تُؤَاخِذُونِي بِالظَّنِّ وَلَكِنِ إذَا أَخْبَرْتُكُمْ عَنِ اللهِ ﷻ بِشَيْءٍ فَخُذُوهُ فَإِنِّي لَنِ أكْذِبَ عَلَى اللهِ شَيْئًا