Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "He who performs ablution properly, then comes to the Friday prayer and listens to it attentively and keeps silent, his sins between that Friday and the following Friday will be forgiven, with the addition of three more days; but he who touches a pebble has engaged in idle activity”.
شرح الحديث :
He who performs ablution properly by performing all of its obligatory, recommended, and supplementary acts, and then comes to the mosque to perform the Friday prayer, listens to the sermon attentively, and refrains from the lawful speech and keeps silent, his minor sins committed between that Friday and the previous Friday will be forgiven, in addition to the sins committed in three more days. However, he who touches the pebble or does any similar idle activity during the sermon, he will lose the reward of Friday prayer.