It is recommended to pray before setting out on a journey

Hasan considered it undesirable for a person to lean against a wall during obligatory prayer without excuse. However, he deemed it permissible to do so in voluntary prayers.

Ibrahim considered it disliked for a person to lean against a wall during prayer, and he also considered it disliked to raise both feet without an excuse.

Ibrahim considered it disliked for a person to lift one foot during prayer, and he also considered it disliked to lean against a wall without a valid excuse.

Hazrat Mujahid says that the more support one takes, the more his reward will be reduced accordingly.

Hazrat Mujahid, regarding the person who takes support from a wall or something similar during prayer, says that the more support he takes, the more his prayer will be diminished.

Hazrat Aamir says that there is no harm in taking support of a wall during prayer.

Hasan considered it undesirable for a person to lean on something during the obligatory prayer without excuse. However, he did not see any harm in this during the obligatory prayer. Hazrat Ibn Sirin considered it undesirable in both obligatory and voluntary prayers.