Samura reported,

The Prophet ﷺ said, "Last night I saw two men who came to me and took me up a tree, then brought me into a house more beautiful and excellent than any I had ever seen. They said, 'As for this house, it is the house of the martyrs.'"

Azami 8081

Sahih

عن سمرة

قال النبي ﷺ: رأيت اللية رجلين أتياني فصعدا بي الشجرة، فأدخلاني دارا هي أحسن وأفضل، لم أر قط أحسن منها قالا: أما هذه الدار فدار الشهداء.

الأعظمي 8081صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Jihad
Chapter
Martyrs and the rulings on martyrdom
Section
Virtue of martyrdom in the cause of Allah the Exalted
Numbering
Jami al-Kamil 8081 (2nd edition)
Azami 8081