A Mother

Abu Hurairah (RA) said:
A man came to Rasulullah (SAW) and said, "Oh Rasulullah, who of mankind is most entitled to the best of my companionship?". Rasulullah replied, "Your mother". He said: "Then who?" Rasulullah said: "Your mother". He said: "Then who?". Rasulullah said: "Your mother". He said : "Then who?". Rasulullah said : "Your father". ( Bukhari, Muslim )