Tawheed page 3 - learnaboutislam.net

Supplicating to other than Allaah
Making Du’aa' to the dead and the absent like the Prophets, Aawliyaa' (pious people), and the like, whether alone or along with Allaah, is an act of Al-Shirk-ul-Akbar (major form of associating others in worship with Allaah).

Ruling on seeking the help of other than Allaah when stricken by misfortune
Anyone who calls upon the Aawliyaa’ after their death or when they are absent is a Mushrik, who is committing an act of major Shirk (associating others with Allaah in His Divinity or in worship).

Supplicating to Allaah by virtue of the status of the Messenger, the Sahaabah, or others
Making Du’aa' to Allaah through the honour or life of the Messenger of Allaah, one of the Sahaabah, or others is not permissible.

Slaughtering for other than Allaah and seeking the help of the dead and the absent
It is not permissible to slaughter camels, cows, sheep, or anything else on graves.

Supplicating to Allaah by His Most Beautiful Names
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 (all) the Most Beautiful Names belong to Allaah, so call on Him by them].

Supplicating to Allaah
It is permissible to say when seeking the help of Allaah, Glorified and Exalted be He, "O Mu‘in (Supporter)! O Lord!" or to say when asking to make easy what is difficult, "O Musahil (He who facilitates)! O Muyassir (He who makes easy)! O Lord".

Seeking help from the Jinn to fulfil one's needs
Seeking the help of the Jinn and turning to them to fulfil needs, such as asking them to harm or benefit a person, is an act of Shirk.

Invoking the Messenger or other people when standing up or sitting down
The person who invokes Allaah's Messenger (عليه السلام) or other person such as `Abdul-Qadir Al-Jelanee when standing up or sitting down is committing an act of Al-Shirk-ul-Akbar.

Seeking the help of the Prophets and Aawliyaa'
Asking anyone other than Allaah for help, to bring healing, to make it rain, to prolong one's life, or similar requests that lie in the Power of Allaah Alone is a form of major Shirk.

Believing in the permissibility of making vows and slaughtering animals for the dead
The belief of a Mukallaf (legally competent person) that vowing or slaughtering sacrificial animals to those buried in graves is permissible, is considered Shirk.

Seeking help from and making vows to the Aawliyaa' or supplicating to Allaah by the virtue of their status
Seeking the Aawliyaa's help at their graves, vowing to them or considering them intercessors to Allaah and asking them to do so is Shirk Akbar.

Undesirability of making vows
Vowing is an undesirable act for a Muslim, for it is authentically reported that the Prophet (عليه السلام) said: A vow is not a means of bringing good but a means to extract good from the miserly people.

Making vows at the shrines of Shaykhs
Making vows by the shrines of Shaykhs is Shirk (associating others with Allaah in His Divinity or worship).

Prostrating and slaughtering animals at graves
Making Sujood (Prostration) and slaughtering animals at graves are idolatrous habits and acts of Shirk Akbar (major form of associating others in worship with Allaah).

Slaughtering animals for a so-called Walee and building a shrine over his grave
Slaughtering for the dead person is a type of Shirk (associating others with Allaah in His Divinity or worship).

Slaughtering animals to entertain guests or out of generosity towards one's family
There is a prohibition of offering sacrifices to the dead Prophets or Aawliyaa' (pious people), seeking their blessing; or offering sacrifices to the Jinn.

Slaughtering animals at the graves of Aawliyaa'
It is authentically narrated that the Prophet (عليه السلام) said, Allaah has cursed the one who slaughters (sacrifices) to other than Allaah.

Visiting the graves of Aawliyaa' and asking them to fulfil one's needs
It is authentically reported that the Prophet (عليه السلام) said: Allaah has cursed the one who sacrifices for other than Allaah…

Reciting Soorah Al-Ikhlaas, Al-Mu`awwidhatayn, and Al-Faatihah for healing
Reciting Soorah Al-Ikhlaas, Mu‘awwidhatayn, Al-Faatihah and other Soorahs is regarded as a permissible Ruqyah (recitation for healing or protection).

Invoking Allaah by His Names for healing
Muslims can Du’aa' (supplication) to Allaah using His Names for the cure of their illnesses.