Q 1:
The saying: "Allah is in the hearts of believers.''
Does it indicate that the one who says it is a believer in Hulul (a Sufi term meaning indwelling)? What is the deviating sect that believes in such a saying?
A:
It is more proper not to say "Allah is in the hearts of believers" as it may allude to a belief in Hulul. Alternatively, one can say, "Believers love Allah." Allah (Exalted be He) says:
But those who believe, love Allâh more (than anything else).
He (Glorified be He) also says:
Allâh will bring a people whom He will love and they will love Him
However, if, by saying such a statement, one means that Allah's love is dominating the hearts of believers and that they fear Him, it will be alright (Part No. 2; Page No. 390) as it is a sound meaning. In this regard, Allah (Exalted be He) says:
It is those who have knowledge among His slaves that (most) fear Allâh.
He (Glorified be He) also says:
But for him who fears the standing before his Lord, there will be two Gardens (i.e. in Paradise).
Moreover, He (Exalted be He) says:
The Mosques of Allâh shall be maintained only by those who believe in Allâh and the Last Day, perform As-Salât (Iqâmat-as-Salât), and give Zakât and fear none but Allâh.
Surah Al-Tawbah.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.