Abu Waail reported,

Abu Musa said to Abdullah bin Masud, "If a person cannot find water, should he not pray?"Abdullah replied, "If I were to grant them this concession, then whenever one of them found the water cold, he would do this," meaning he would perform tayammum and pray.Abu Musa said, "I asked, 'Then what about what Ammar said to Umar?'"Abdullah answered, "I did not see that Umar was satisfied with what Ammar said."

Bukhari 345

Sahih

حدثنا بشر بن خالد قال حدثنا محمد هو غندر أخبرنا شعبة عن سليمان

عن أبي وائل قال

قال أبو موسى لعبد الله بن مسعود إذا لم يجد الماء لا يصلي قال عبد الله لو رخصت لهم في هذا كان إذا وجد أحدهم البرد قال هكذا يعني تيمم وصلى قال قلت فأين قول عمار لعمر قال إني لم أر عمر قنع بقول عمار

البخاري 345صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Tayammum
Chapter
If a person in a state of major ritual impurity fears illness or death, or fears thirst, they perform tayammum
Numbering
Darussalam 345
Bukhari 345