(138) باب الْجِهَادِ بِإِذْنِ الأَبَوَيْنِ
Narrated `Abdullah bin `Amr:
A man came to the Prophet (ﷺ) asking his permission to take part in Jihad. The Prophet (ﷺ) asked him, "Are your parents alive?" He replied in the affirmative. The Prophet (ﷺ) said to him, "Then exert yourself in their service."
Reference: Sahih al-Bukhari 3004
In-book reference: Book 56, Hadith 213
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 248