Rights of Parents and Treating them Kindly -

Imam Sadiq (a.s) said: Do not say even a word of contempt to your parents, as Allah has forbidden it.

Imam Sadiq (a.s) said: Whoever wishes that Allah make his death an easy one should increase visiting his relatives, and be kind with his parents. Then Allah will make his death an easy one, and he will never get poor during his life.

Holy Prophet (saw) said: Allah's pleasure is tied to parent's pleasure and Allah's anger is tied to parents anger.

Holy Prophet (saw) said: The reward of each kind look of a good child to his parents is one accepted holy pilgrimage. He was asked: O' Prophet of God! Does this hold true even if he does it a hundred times each day. The Prophet (a.s) said: Yes. God is the greatest, and the purest.

Holy Prophet (saw) said: God will increase the life of whoever is kind with his parents.

Reference: Mishkat Ul Anwaar - Section 3, Chp. 14