السلام عليكم ورحمة الله Ustadh If I made the takbeerAl Ihram but before going for ruku' completely I hear the imam Takbeer for rising up. I them still do the ruku', do I have that Raka'ah since I already joined the prayer or I lost it as I have not done thr ruku' completely before imam rises.

Ustadh AbdulAziz al-Haqqan

If he said, "Sami' Allahu liman hamidah," before you make the ruku', then this rak'ah does not count for you.