​Memorizing

Three things eliminate forgetfulness and incite remembrance: recitation of the Qur'an, brushing the teeth, and fasting.

رسولُ اللَّهِ صلى اللَّه عليه وآله :  مَثَلُ الّذي يَتَعلّمُ في صِغَرهِ كالنَّقْشِ في الحَجَرِ ، ومَثَلُ الّذي يَتَعلّمُ في كِبَرِهِ كالّذي يَكتُبُ على‏ الماءِ . كنز العمّال : 29336 .

 The Prophet (SAWA) said, 'The similitude of one who learns in his childhood is like carving on stone, whereas the similitude of one who learns in old age is like writing on water.' Kanz al-Ummal, no. 29336

رسولُ اللَّهِ صلى اللَّه عليه وآله :  ثلاثةٌ يُذهِبنَ النِّسيانَ ويُحْدِثْنَ الذِّكْرَ : قِراءةُ القُرآنِ ، والسِّواكُ ، والصِّيامُ . بحار الأنوار : 62 / 266 / 39 .

 The Prophet (SAWA) said, 'Three things eliminate forgetfulness and incite remembrance: recitation of the Qur'an, brushing the teeth, and fasting.' Bihar al-Anwar, v. 62, p. 266, no. 39