During the life-time of the Prophet ﷺ I built a house with my own hands so that it might protect me from the rain and shade me from the sun; and none of Allah's creatures assisted me in building it.  

رَأَيْتُنِي مَعَ النَّبِيِّ ﷺ بَنَيْتُ بِيَدِي بَيْتًا يُكِنُّنِي مِنَ الْمَطَرِ وَيُظِلُّنِي مِنَ الشَّمْسِ مَا أَعَانَنِي عَلَيْهِ أَحَدٌ مِنْ خَلْقِ اللَّهِ  

Ibn ʿUmar said, "By Allah, I have not put a brick over a brick (i.e. constructed a building) or planted any date-palm tree since the death of the Prophet." Sufyan (the sub narrator) said, "I told this narration (of Ibn ʿUmar) to one of his (Ibn ʿUmar's) relatives, and he said, 'By Allah, he did build (something.' "Sufyan added, "I said, 'He must have said (the above narration) before he built."  

ابْنُ عُمَرَ وَاللَّهِ مَا وَضَعْتُ لَبِنَةً عَلَى لَبِنَةٍ وَلاَ غَرَسْتُ نَخْلَةً مُنْذُ قُبِضَ النَّبِيُّ ﷺ قَالَ سُفْيَانُ فَذَكَرْتُهُ لِبَعْضِ أَهْلِهِ قَالَ وَاللَّهِ لَقَدْ بَنَى بَيْتًا قَالَ سُفْيَانُ قُلْتُ فَلَعَلَّهُ قَالَ قَبْلَ أَنْ يَبْنِيَ