No one in the history of Islam shares the words of praise that the Holy Prophet Muhammad (P.B.U.H&H.P) used for Imam Ali (A.S). For example he said:
“If all the trees were pens, if all the seas were ink, if all the jinn and men wrote them down, even then the merits of Ali ibn Abi Talib (A.S) could not be counted.”
“Ali and I are from the same Light”
“Ali is from me and I am from Ali.”
“Ali is the first person to believe in my Prophet hood and will be the first person to meet me on the Day of Judgment.”
“I am the city of knowledge and Ali is its door. He who wants to gain knowledge should come through the door.”
“I am the store-house of wisdom and Ali is its door.”
“Whoever wishes to see Adam in his knowledge, Noah in his piety, Abraham in his patience, Moses in his strength, and Jesus in his worship and devotion should look at Ali ibn Abi Talib.”
“He who loves Ali loves me and he who hates Ali hates me.”
“O Ali! You are the leader in this world and the hereafter.”
“Ali is with the Truth and Truth is with Ali.”
Ref: Shia Books for Children