Sahih al-Bukhari
Wishes
كتاب التمنى
Chapter 9: What uses of Al-Lau are allowed
مَا يَجُوزُ مِنَ اللَّوْ
وَقَوْلِهِ تَعَالَى: {لَوْ أَنَّ لِي بِكُمْ قُوَّةً}.
And he said: “If I have a power,” he said.
Translation
Narrated `Abdullah bin Zaid
The Prophet (ﷺ) said, "But for the emigration, I would have been one of the Ansar; and if the people took their way in a valley (or a mountain pass), I would take Ansar's valley or their mountain pass."