What is the main topic of Bulugh al-Maram Hadith 146?

Bulugh al-Maram Hadith 146 is from chapter "The Book of Purification". Summary: "Then perform ablution for every prayer" .

Bulugh al-Maram: Hadith 146

1. The Book of Purification

1/9 Chapter:

باب التيمم

146

Bulugh al-Maram

وَلِلْبُخَارِيِّ: { ثُمَّ تَوَضَّئِي لِكُلِّ صَلَاةٍ } (86)‏ .‏

Al-Bukhari's version adds:

"Then perform ablution for every prayer" .

Reference: Bulugh al-Maram 68
In-book : Book 1, Hadith 80
English translation : Book 1, Hadith 74