Rasolallah (S.A.W) Ne farmaya,

‘jab namaz kharri ho jaye, to bhaagty hoay na aao, balky aam raftar say chall kr aao, tum par itminan say aana wajib ha.Namaz ka jo hissa imam k sath mil jaye wo ada kro, aor jo reh jaye osay bad ma mukamal kro

(bukhari)