عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ أَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِذَا صَلَّى قَائِمًا رَكَعَ قَائِمًا، وَإِذَا صَلَّى قَاعِدًا رَكَعَ قَاعِدًا
Sayyidah Aisha (may Allah be pleased with her) says that when the Messenger of Allah (peace and blessings be upon him) performed prayer standing, he would also perform the bowing (ruku') standing, and when he performed prayer sitting, he would also perform the bowing sitting.