It is mandatory to say it between the two sajdah. It is not to be said before tashahud.

Is it necessary to say “rabbi ighfirlee” after the two sajdas and before the tashahhud, or do we only say it between the two sajdas

Prayer | March 25, 2014 4:17 am
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I live in the UK where isha prayer in the summer becomes very late (reaches 11:40pm) and fajr 3am, so my local mosque is combining maghrib and isha prayer. But the other mosque 5 minutes away from it doesn’t combine (they are both shafi’i madhhab). I have been told by the imam that (combines maghrib and isha) this is permissible for everyone, even if you do not have work in the morning or something. Can you please tell me the rulings on this because I am confused,
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Here in UK, as per ECFR(European Council for Fatwa & Research), we are allowed to combine maghrib & isha during summer,Due to the delayed disappearance of red-twilight & that the Ishaa is too late around 12AM & the Fajr starts at 3AM. So, I would like to know: -1 – If am I permitted to pray in home, alongwith my friends (small Jama’ah), knowing that we guys would be awake at exact Ishaa time every day & also we could wake up for Fajr as well?