Upon mentioning the names of the Sahaabah (Companions), should we say: عليه السلام or رضي الله عنهم ?

Question 10: Is it permissible upon mentioning the name of one of the Sahaabah (Companions of the Prophet) to say, “Peace and blessings be upon him” instead of “May Allaah be pleased with him”?

Answer: It is permissible to say, “Peace be upon him” upon mentioning a Sahaabee (Companion of the Prophet) or some other person, for Imaam Al-Bukhaaree reported in his Saheeh (Book of Authentic Hadeeth), under the chapter on “Sending peace and blessings on other than the Prophet (peace be upon him)” and Allaah’s saying: …and invoke Allaah for them. Verily, your invocations are a source of security for them on the authority of the following chain of narration… read more here.

Invoking Allah and seeking to draw close to Him by His Most Magnificent Names

Question 16: Allaah (Exalted be He) says (what means): “And  (all) the Most Beautiful Names belong to Allaah, so call on Him by them”. How can Allaah be supplicated to by His Most Beautiful Names; should He be supplicated to by ten of His Names or more, or can it be just by the Name befitting the reason for the Du’aa (supplication)?

Answer: It is lawful to supplicate to Allaah and seek to draw close to Him by His Most Beautiful Names, as Allaah (Exalted be He) says: “And the Most Beautiful Names belong to Allaah, so call on Him by them”. Imaam Ahmad reported a Hadeeth narrated by Ibn Mas‘ood, that… read more here.

Is it permissible to establish Salaah behind anyone who seeks help from the dead?

Question 4: An Imaam of a Masjid (mosque) seeks help from dead people in their graves, claiming that these are the graves of Awliya’ (pious people) to whom we should resort. He says that they may act as mediators between us and Allaah (Exalted be He). Am I allowed to perform congregational Salaah (Prayer) behind this Imaam, despite the fact that I call for Tawheed (belief in the Oneness of Allaah)? Could you please also clarify such questions as making vows, seeking help from other than Allaah, and Tawassul (seeking to draw close to Allaah) through a means?

Answer: If you are sure that the Imam you mentioned seeks help from the dead or vows to them, then it is not permissible to perform Salah behind him because he is considered a Mushrik (one who associates others with Allah in His Divinity or worship); the Salah he performs… read more here.