On the authority of Abu Sa`eed al-Khidri (may Allah be pleased with him), who said that the Messenger of Allah (PBUH) said:

"Allah will say to the inhabitants of Paradise: {O inhabitants of Paradise!} They will say: 'O our Lord, we present ourselves and are at Your pleasure, and goodness rests in Your hands.'

Then He will say: {Are you contented?}

And they will say: 'And how should we not be contented, O Lord, when You have given to us that which You have given to no one else of Your creation?'

Then He will say: {Would not like Me to give you something better than that?}

And they will say: 'O Lord and what thing is better than that?'

He will say: {I shall cause My favor to descend upon you and thereafter shall never be displeased with you.}

Related by al-Bukhaari (also by Muslim and at-Tirmizhi).