صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
باب النوافل - ذكر البيان بأن قول عائشة فإذا صلى قاعدا ركع قاعدا أرادت به إذا افتتح الصلاة قاعدا ركع قاعدا
Section on voluntary prayers – clarification that ‘Aisha’s statement “if he prayed sitting, he bowed sitting” means if he started the prayer sitting, he would bow sitting
1 hadith
Hadith 2511
Sayyidah Aisha Siddiqa (may Allah be pleased with her) narrates: The Prophet Muhammad (peace be upon him) used to perform prayer both standing and sitting. When he started the prayer standing, he would go into bowing (ruku) from the standing position, and when he performed the prayer sitting, he would go into bowing while sitting.