Staffan is correct:
"You prepare the list of cleric spells that are available for you to cast, choosing from the cleric spell list. When you do so, choose a number of cleric spells equal to your Wisdom modifier + your cleric level (minimum of one spell). The spells must be of a level for which you have spell slots." (Basic Rules, p.22)
So, while the multiclassing rules do say you prepare spells as a caster of your class level, a wizard19/cleric1 does have ninth-level spell slots (see the chart for determining your spell slots as a multi-class caster), and thus could prepare ninth level spells. You could likely only prepare a total of 6 cleric spells as a first level cleric (as ccooke notes, with a Wis of 20 and one cleric level, that gives you a list with six cleric spells), but nothing in the multiclassing rules prevents you from preparing a ninth level spell, or any other non-cantrip for that matter, in that list of six spells.
Likewise, a cleric2/wizard3 could include 3rd level spells on his list of prepared cleric spells, since
he has third level slots, but could only contain 3rd level wizard spells if he had 3rd level wizard
spells in his spellbook (which is possible if he finds a scroll with a 3rd level spell and scribes it into
his spellbook).
"You prepare the list of cleric spells that are available for you to cast, choosing from the cleric spell list. When you do so, choose a number of cleric spells equal to your Wisdom modifier + your cleric level (minimum of one spell). The spells must be of a level for which you have spell slots." (Basic Rules, p.22)
So, while the multiclassing rules do say you prepare spells as a caster of your class level, a wizard19/cleric1 does have ninth-level spell slots (see the chart for determining your spell slots as a multi-class caster), and thus could prepare ninth level spells. You could likely only prepare a total of 6 cleric spells as a first level cleric (as ccooke notes, with a Wis of 20 and one cleric level, that gives you a list with six cleric spells), but nothing in the multiclassing rules prevents you from preparing a ninth level spell, or any other non-cantrip for that matter, in that list of six spells.
Likewise, a cleric2/wizard3 could include 3rd level spells on his list of prepared cleric spells, since
he has third level slots, but could only contain 3rd level wizard spells if he had 3rd level wizard
spells in his spellbook (which is possible if he finds a scroll with a 3rd level spell and scribes it into
his spellbook).
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