Al-Rayyaan is for people observing Saum:
Book of Fasting:
Narrated Sahl Bin Sa'd:
Aap (ﷺ) ne farmaya Jannat ka ek darwaza hai jise al-Rayyaan kehte hai, Qayāmat ke din iss darwāza se sirf rozedar hi jannat me dākhil honge unke siwa aur koi usme nahi dākhil hoga, pukāra jaiga ke rozedar kahān hai? Woh khade ho jāyenge toh unke siwa usse aur koi nahi andar dākhil ho pāyega aur jab yeh log andar chale jāyenge toh yeh darwaza band kar diya jaiga phir usse koi andar na ja sakega.
(Sahih Bukhari, Book 30, Hadith 6)
Book of Fasting:
Narrated Sahl Bin Sa'd:
Aap (ﷺ) ne farmaya Jannat ka ek darwaza hai jise al-Rayyaan kehte hai, Qayāmat ke din iss darwāza se sirf rozedar hi jannat me dākhil honge unke siwa aur koi usme nahi dākhil hoga, pukāra jaiga ke rozedar kahān hai? Woh khade ho jāyenge toh unke siwa usse aur koi nahi andar dākhil ho pāyega aur jab yeh log andar chale jāyenge toh yeh darwaza band kar diya jaiga phir usse koi andar na ja sakega.
(Sahih Bukhari, Book 30, Hadith 6)