Anas bin Malik reported,

We used to see him, meaning Thabit bin Qays, walking among us, and we knew that he was one of the people of Paradise. On the day of Yamamah, some of our ranks broke and retreated. Then Thabit bin Qays bin Shammas came, having already perfumed himself with embalming scent and put on his burial shroud, and he said, "What a wretched way you are accustoming your enemies to deal with you." Then he fought them until he was killed.

Azami 10120

Sahih

عن أنس بن مالك قال

كنا نراه- أي ثابت بن قيس- يمشي بين أظهرنا ونحن نعلم أنه من أهل الجنة، فلما كان يوم اليمامة كان فينا بعض الانكشاف، فجاء ثابت بن قيس بن شماس، وقد تحنط ولبس كفنه، فقال: بئسما تعودون أقرانكم، فقاتلهم حتى قتل.

الأعظمي 10120صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Virtues of the Companions and reports about them
Chapter
Virtues of individual Companions and their reports
Section
Thabit bin Qays is among the people of Paradise
Numbering
Jami al-Kamil 10120 (2nd edition)
Azami 10120