It is narrated from Saeed bin Jubair (may Allah have mercy on him) that Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: Repeat the hadith so that you do not forget, because hadith is not compiled and preserved like the Qur'an. If you do not review it, you will forget it. Also, none of you should say, "I narrated the hadith yesterday, so I will not narrate it today." Rather, even if you narrated the hadith yesterday, narrate it today as well, and narrate it tomorrow too.